This 8" hard drive doesn't seem to exist (or does it?)

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Күн бұрын

In this day and age, we are used to being able to find information about technology that existed, even stuff from the early 80s. This 8" hard drive made by Hokushin seems to be pretty much undocumented. A mystery.
Is there any hope of getting this drive hooked up to a computer and working?
--- Info
Hokushin CD 8010P (Hokushin CD 8000 family)
Priam DiskOS1070 (drive)
Priam Smart Interface (interface card)
Computer Design 1981 volume 10 has an ad for the drive: US$1985 with the interface card included, power supply an extra US$295
--- Video Links
Priam DiskOS1070:
www.bitsavers.org/pdf/priam/DI...
Priam Smart Interface:
www.bitsavers.org/pdf/priam/SM...
Ad for the drive from Computer Design:
imgur.com/XZPVZ9w
ROM dumps and high resolution photos:
github.com/misterblack1/Hokus...
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@adriansdigitalbasement Жыл бұрын

Additional information from Patron Peter Kooiman: it appears this drive is the (or is similar to) the Priam DiskOS1070 and that the interface card is the Priam Smart Interface. There is documentation on it here: www.bitsavers.org/pdf/priam/DISCOS_1070_Product_Specification.pdf www.bitsavers.org/pdf/priam/SMART_Interface_Product_Specification_Nov80.pdf It does require a spin-up command so that explains the lack of activity! Computer Design 1981 volume 10 has an ad for the drive: US$1985 with the interface card included, power supply an extra US$295 Ad: imgur.com/XZPVZ9w

@dauerwerbesendung7045 Жыл бұрын

I"m sold. All of that for as little as $1895 with Terminator included, of course!

@Chris_In_Texas Жыл бұрын

If you reference the #4 from the listing of defunct HDD companies, you will notice down in the tables that #6 lists that Priam used/contracted Hokushin Electric as the assembler for the HDDs itself in the early 80's. So that would make sense. 👍😁

@mrfrenzy. Жыл бұрын

That's a really great find. Reading the manual explains the hour counter, mean time to failure 10 000 hours which is just over one year. They do say that most repairs should be completed in ½ hour.

@jacktheripper6716 Жыл бұрын

I found old adverts 1980 to 1982 they started at $1899.99 (matchmaker technology) other info i found was a page in mini-micro systems 1982 sad to say its digital scans are gone

@kittyztigerz Жыл бұрын

i recognized that pcb before it need pc to tell it power up to turn on motor if no communication from pc it does nothing it in standby mode saving power waiting for communication from pc when it get communication from pc it switch to power up mode i heard it from someone own it just trying save it self from not being worn out unlike other hdd just get power and spring up i think there is way troubleshooting it if you have hook up to pc with diagonal in slot can be come handy i dont know if they video still out there or not i take look n see what can find

@JRoughgarden1 Жыл бұрын

That power supply was built in Hackensack NJ. I was the computer operator for their business applications. This unit was most likely early 80's as the later part of that decade RTE from Wisconsin purchased PowerMate rebranding was RTE/PowerMate. BTW that was not the original power cord.

@nutzeeer Жыл бұрын

The internet sure is small sometimes. Cool to know!

@1993MAZDAMIATA Жыл бұрын

Dang newjersey

@gregm1457 Жыл бұрын

Ive used a few different PowerMate supplies, they are good stuff. Those arent a good match for the drive... I guess the last operator had them on hand, so thats what he used...

@brucereynolds7009 Жыл бұрын

Related to the Roughgarden family of Midland Park? Paul, Nancy.

@TombstoneChris Жыл бұрын

That means you're old.

@Nas_Atlas Жыл бұрын

I love how this channel has gone from swapping chips on a commodore 64 to some serious hard core geek material. Awesome stuff.

@magicphred Жыл бұрын

The "Computer History Museum" has a link to a "CD-8010P" Hard Drive (Inside an Advanced Computer Design PDQ-3 Computer) You can also find ( from "bitsavers" ) "PDQ-3 System Users Manual Ver 3.1 Apr81" and "PDQ-3 Hardware Users Manual Jan81" (I'm not sure if the weblinks I added in prior messages will get deleted)

@alakani Жыл бұрын

Makes sense, Computer History Museum is in Mountain View and that Priam board was made in San Jose a few minutes away. I bet that thing at some point passed through a place I used to work called WeirdStuff Warehouse in Sunnyvale, I miss that place heh

@JamieStuff Жыл бұрын

@@alakani Ah, WeirdStuff. The best place to buy swag from defunct companies. I still have my MediaVision screwdriver that I bought from that store. Across the street from the old Fry's that had "Enter" and "Escape" keys on the doors. Pre DotCom implosion.

@neillthornton1149 Жыл бұрын

@@alakani man, Weird Stuff. Used to love just walking through there and seeing what they had.

@paulstubbs7678 Жыл бұрын

It seems the only links KZfaq leaves alone are links to other KZfaq video's You can probably blame this on all the scam artists with links (and Telegram 'codes') to various get rich quick crowds (In reality, get poor quick, with their help)

@tinytonymaloney7832 Жыл бұрын

Does that mean with the extra info we can have a part 2?? Basic knowledge only of electronics and logic and this was way above me but I was fascinated.

@halfabee Жыл бұрын

In about 1983 I was working for Link House publications as a Analyst Programmer. The computer room was quite large. 60 foot by 40 foot. Filled with 4 foot square hard drives. The operator used to walk around the hard drives every morning checking the temperature of the air coming out of the hard drive, One morning he noticed one drive was hotter than the others hence he closed the computer system down and called an IBM engineer who changed a bearing on the drive.

@lolbots Жыл бұрын

a living resource monitor lmao

@PeterSwinkels Жыл бұрын

That thing is small considering the original harddrives were the size of a washing machine...

@PeterSwinkels Жыл бұрын

LOL - I accidentally replied to someone else's comment!

@paulstubbs7678 Жыл бұрын

Wow, what a different world. These days the whole contents of that room would fit on a USB memory stick, kind of crazy

@PeterSwinkels Жыл бұрын

@@paulstubbs7678 : indeed

@evaDrepuS Жыл бұрын

For some of us it does not matter that you might not get something going, it is still enjoyable to watch you work through your thought process, as we still learn from it.

@8bitrocketstudios Жыл бұрын

100%

@gmirwin Жыл бұрын

Exactly.

@koekone Жыл бұрын

Enjoyed this episode really much, thank you.

@Kassetkyn Жыл бұрын

@BersekViking Жыл бұрын

The spikes you see on the 5v rail and other places is caused by the long ground lead on your scope probe. 1: It picks up noise from the board and that is "in series" with probe so it looks like it is on the signal. 2: Your grounding is far away from where you are probing. Ground is not ground when it comes to high frequency AC signals. Always try to use a short ground cable to the probe as close as possible to the place you are probing.,

@gregm1457 Жыл бұрын

Yep ground noise will get you every time 👍

@GrayRaceCat Жыл бұрын

I used to work for circuit (PCB) makers in the late 70s early 80s, and I would bet that the E.C.1283 marking is the circuit Manufacturers initials followed by the month and 2-digit year, Dec 1983. It was a common practice back then. For example, a company I worked with in Fort Lauderdale, FL was called Tropical Circuits and they would have put TC1283 on their boards.

@jamessmith1652 Жыл бұрын

I haven't a clue anything Adrian talks about. I just enjoy watching all his videos, pleasant and intelligent guy talking passionately about his interests.

@ricardog2165 Жыл бұрын

Adrian is the Bob Ross of Retro Computing!

@christinesmith734 Жыл бұрын

Same, I know very little about what goes on inside a computer. Adrian makes it so interesting.

@ChildrenOfTheRosary Жыл бұрын

@@ricardog2165 Happy little IC’s!

@iteachtime Жыл бұрын

Looking forward to part II of this very interesting hardware. Thank you Adrian for posting these even when there isn't an instant resolution. Gives me something to look forward to!

@DEtchells Жыл бұрын

A quick note on the white strips on the processor board: I agree that they’re for power distribution and decoupling. I forget the manufacturer (US, I think it started with an “R”, Rogers maybe?), but I used a product back around ~1990 for decoupling chips on problematic boards. They were thin flat packages that sat under the chips, with pins sticking down into the power and ground pads. You’d stuff them in the board, stuff the chips in on top of them and then solder. The big advantage was that they had essentially zero inductance because the pins commented directly to the flat electrodes of the capacitor. I used them on a 2-layer board that had noise problems and they did the trick. I think the same company also made longer units for power distribution. They made the board layout easier because you didn’t have to worry about power/ground routing, and also had the advantage of very low resistance and inductance (the conductors were flat strips of relatively heavy-gauge metal), and the bypass capacitance was fully distributed along the length of the bus.

@DEtchells Жыл бұрын

@SiliconValeyGeek Ah, I'd forgotten about the SIP versions; we had some as samples, but only used the flat packs in production. Good note on the 74Sxx parts - I never had to deal with them but think I used some 74AS, which were actually faster, but their speed-power product was less than a third that of 74S.

@qviewq2071 Жыл бұрын

We used to maintain giant 14" Shugart hard drives sold as Altos 8000 CP/M and MP/M systems. Total capacity 15 MB. We learned that if you checked the heads for continuity with a multimeter it would burn out the heads as the wires were so fine - and they used to spin up too fast and the drive belt would spin off so Workshop Terry devised a plan to put a 1 ohm resister on the motor to slow it down at start up - but it got hot. He them mixed araldite and heat sink compound to try and stick the resistor to the casting that the drive was built on. He found his mixture combined the sticking power of heat sink compound with the thermal qualities of araldite. Fun times.

@TheSimTetuChannel Жыл бұрын

Happy Holidays Adrian! Thank you for all the great videos you've brought us throughout the year. I wish you health and happiness for 2023 and beyond!

@rvenden Жыл бұрын

Hi Adrian - I love the forensic work you do old gear, such as this hard drive and controller. Your approach and thought process is very impressive and very educational. Thank you for the great work and even greater videos. I cannot imagine how much time this must all take. Thanks again.

@papafrank7094 Жыл бұрын

Adrian, I wish you and yours a very happy Christmas season, and I thank you for all of your videos and work you share with us.

@makskk6spm275 Жыл бұрын

I love such videos. Thanks Adrian! Would be great to post more videos like this where you do investigation of some old electronic artifact from the past.

@Tyle_smalcu Жыл бұрын

Merry Christmas, Adrian! Thank you for another year of awesome videos! ^_^

@stevemcknelly5036 Жыл бұрын

I'm guessing that drive was made prior to 1983, since Hokushin Electric Works was merged with Yokugawa to become Yokugawa Hokushin Electric Works in 1983. Back in the 90's, there was a massive text list of HD drive info called "hdlist". I tried to find a copy of it to see if Hokushin was on it, but couldn't find a copy.

@adriansdigitalbasement Жыл бұрын

Yes indeed, the date codes on the ICs are all 1981.

@jwhite5008 Жыл бұрын

Irregardless of this drive, it may be good idea to find and archive this document. If you looked at it in the past, you might remember some text that was definitely in there. Try to google all different things that could be in it in one search query. Did it just have names, or also some kind of parameters? Like heads/cyls/tracks? Or interface? Or size? If so, you could probably find some parameters somewhere else and google them all together. Try putting a dash between numbers that were close together. Although it could easily have been just an internal document that got passed about a few companies.

@garthhowe297 Жыл бұрын

Yes, 5.25", and 8" drives drew a ton of current on startup. I remember on Intel based servers, when the power supplies were getting a little weak, we would have to unplug the power connector from one, or more, 5.25" drives, and plug them in one at a time. Once they were all spun up, do a hard reset, and then you could load the OS. Once we got to 3.5" hd's, the current demands were less, but the problem remained due to a much larger number of drives. On the Compaq servers, they would sequentially power up the hard drives (by SCSI id order) as part of the POST, in order to minimize peak loads. Great video...not a failure at all.

@tw11tube Жыл бұрын

I still have a Compaq Prolinea server in my "digital basement" (of course not powered on 24/7), and you can clearly hear the drop of the +12V supply while the hard drive spins up, as the fan RPM goes down. And that's just with the single Fujitsu M2623F half-height 3.5inch drive that was the basic storage option. The peak spin-up current is 2.5A @ 12V. Don't believe marketing touting this drive as "high-performance [...] hard drives, which increase the performance levels of high-end personal computers, workstations and network file servers", though. They are solid drives, but at 4400rpm and less than snappy seek times, they are mid-level for workstations and bottom-of-the-barrel for servers. An official option for that system was the Compaq SMART-RAID controller with up to 7 drives connected to it, and you would most likely buy bigger and faster drives if you went the RAID route. Of course they did staggered spin-up by default.

@tim0steele Жыл бұрын

Given that you mentioned seeing 4.7V on the board, I'm guessing the power supply was turned up to 5.3V to give 5V on the board.

@adriansdigitalbasement Жыл бұрын

Yes, that might be the case because of voltage drop. I wasn't checking the voltage at the chips

@senilyDeluxe Жыл бұрын

@@adriansdigitalbasement Does the PSU have a sense line? That would explain the voltage going up under load when measuring on the PSU.

@BowWowPewPewCQ Жыл бұрын

Wow, first time viewer. This stirred a bunch of old memories. Glad I found you.

@tony359 Жыл бұрын

Another amazing video! I so much love those almost unknown things you show here!

@mcosta3810 Жыл бұрын

A very Merry Christmas to you, Adrian! Another fine video 👍I've learned a lot from watching all of your videos!

@chadhartsees Жыл бұрын

This is fascinating. The controller board certainly looked different than others shown on the channel - those strips - I don't think we've seen something like that on the channel before. It's fascinating seeing different ways people made boards and solved problems.

@jwhite5008 Жыл бұрын

You might like to look at main board of Centurion computer that "Usagi Electric" is restoring. That one has actual wires (not traces) INSIDE the board epoxy. The video is called "Minicomputer Part 4: In-depth Look at all the Computer PCBs" at timestamp 19:56

@chadhartsees Жыл бұрын

@@jwhite5008 ooh! I've watched some in that series, I don't know if I've watched that part. Thanks!

@paulstubbs7678 Жыл бұрын

I remember seeing ad's for very similar strips, they were advertised as bringing low impedance DC and bypass caps right up to the IC:s. These days with multi layer circuit boards with a ground & supply plain this is no longer an issue, but back then two layers PCB's was all most had access to

@davros1971 Жыл бұрын

Back in my dim dark past of the early 80's I was working on/supported some Basic 4 (en.wikipedia.org/wiki/MAI_Basic_Four) computers and S100 devices around Sydney For Rank industry's one fun job was that they had an s100 card system that was installed in the Sydney(Australia) container port that some ham-fisted dock worker attempted to reseat some cards one card had strips like that but mounted 90" to the surface of the board they supplied the power rails and also isolated each row of chips my muscled friend had managed to break a few connections and making them intermittent. a couple of hours with a magnifier and fine wire fixed the issue in those days it was weeks/months to get weird parts by ship or $ 1000s for air freight so it was mostly surgery, canablise or invent something to replace what was broken once knocked up a replacement lm741 op amp out of bits to get a industrial metal detector working while I waited a week for a replacement part

@wmlindley Жыл бұрын

I worked on some DTC (Data Technology Corp) SASI controllers, integrating them into the Heath/Zenith Z-100 ecosystem. The Z-100 was DOD's "Desktop One" back in the 1980s and our customers were mostly military installations, and folks from the Heathkit world. 50-pin is almost certainly SASI, but that host adapter (the upper board) is a weird one for sure! "EC" is probably Engineering Change and a date-code.

@samuelcolvin4994 Жыл бұрын

I remember the zenith machines! Bulletproof monsters those were!

@Jimblefy Жыл бұрын

Very cool. I'd love to see you get that drive running. Amazing retro tech.

@bobsbarnworkshop 3 ай бұрын

I just came across this video! I was in community college ET from 79-81. For my senior design and build project I made an all discrete LED mantle clock which consisted of 60 mini green LEDs for seconds, 60 mini yellow LEDs for minutes and 48 jumbo LEDs for quarter hours. It took over 25 ttl logic chips ( no clock chips, just counters dividers a decade drivers) all wire wrapped !

@FXGreggan. Жыл бұрын

Had something similar in a PDP-11 at work, it was a laser marking semiconductor chips. I was the service engineer maintaining the machine and I remember the 10Meg Winchester HDD was very heavy and it needed several minutes to spin up and get warm before being able to use it...

@aaron71 Жыл бұрын

Loved watching this in depth exploration of the drive! I have two Shugart 8" HDD that have AC motors for the spindle so I've been able to at least spin them up. Maybe someday I'll figure out how to connect them to a system!

@davidsurety2629 Жыл бұрын

Have been subscribed for years love your Channel Dave uk

@JoeMcLutz Жыл бұрын

Merry Christmas Adrian! 🎄😊

@RogerBarraud Жыл бұрын

Merry Christmas, Adrian! Hope you have plenty of social / retrohacking fun 🙂

@annareismith6843 Жыл бұрын

I demilitarised took apart and destroyed the discs in many of those like that at Puget Sound Naval Shipyard I was working for. And stripped out many boards on computer server towers for precious metals of gold platinum and silver recovery in the late '80s and early '90s. So I have seen so many of those. I would see that one there a lot. Those and tape drives. A lot of optical hard drives too. I loved stripping them apart. I would have to smash and drill holes in so many Hard drive discs. Some really old and very big ones. I saw so much cool stuff most did not get to see or know what they are and even now I am still learning what they were. Some were so secret I will never know. And they are so outdated now though back then they were very high-tech. I saw the first CD ROMs before most did. A lot of things the average consumer could not get or afford I had to play around with. I even saw many Commador 64 used that were on ships. A lot of them came through where I worked in a large tall pile on many pallets for me to ship to be sold in DRMO DLA auctions. Many Printers Tape and Floppy Drives and Monitors for them too. I would grab the best ones and play games on them till they died I would have many of them at my work desk in case one died on me I could not fix myself when on break or at lunch or get there early to play them tell I start working. I used them to make documents I printed for shipping things too. I made my own program for it just to do that.

@shadyweaver Жыл бұрын

Very cool read, thank you for sharing this experience with us!

@OtherWorldExplorers Жыл бұрын

I really love this non-standard stuff. Trickle it in whenever you have the time to. I'll look forward to the next episode after I'm done with this one.

@kevinchastain727 Жыл бұрын

The spin up problem maybe because the drive is set on " Start on Command " this is set with a jumper on the drive itself it will power up the board but will not spin the drive until it receives a command to start the clunk you hear on starting the drive is the head locking to parked position.

@ClearComplexity Жыл бұрын

Definitely not a disappointing video. It's always interesting just to see the older boards that are filled with logic chips over single packages. I've built my own emulation setups that use microcontrollers similar to how something like the C64 had a handful of special purpose-built chips to handle tasks. It's a bit silly when you could easily just emulate it all on a Pi nano or something, but I like the idea of this microcontroller handles io/storage access, this microcontroller acts as a main processor, another mc circuit handles graphics/sound, etc. It's cheaper and easier for me to breadboard that type of design with spare atmegas I used to use for custom keyboards or something over buying an fpga board and recreating the logic from scratch using schematics for something like an Apple ][. Of course, now something like the RP2040 would be way overkill and let you build a basic Apple][ in the size of a thumb drive almost.

@Colin_Ames Жыл бұрын

It wasn’t a disappointing video at all, but rather a very interesting one. Maybe in the future you’ll get more information that will enable you to get it working. Merry Christmas 🎄

@getdrinking Жыл бұрын

Merry xmas Adrian and viewers

@gblackhead Жыл бұрын

Hello Adrian Just a few side notes: Most of the chips are made in 1980 & 1981. Even the EPROM chips. But the CPU on one of the boards seems to be from 1984. It could be serviced/replaced some time after the production, or the the drive could be completed some time later, after those boards... The 5V line ripples could be caused by the surge in the logic, trying to do something, or by the output lines trying to drive the power transistors to actually "move" something... SASI stands for "Shugart Associates System Interface" For the SCSI there are single-ended and differential modes. The single-ended works with signal wires versus the ground. But for the differential, it works with two data lines, one driven up to the "+" signal, the other down to the "-" signal, changing the both wires polarity with the data changes. So the terminator connecting the two data lines could mean the differential mode. And there is only 8-bit data in the SCSI-1 (I wasn't able to find much about the SASI pinout). You could use some sort of the logic analyzer (f.e. one based on the Arduino) to trap just all of the address pins (together with ALE pin) to see the address at which the code is cycling... Then, with the EPROM code being disassembled you could see more of what's going on... And last but not least: THANK YOU for the very interesting content! ;-)

@InfiniteBrain Жыл бұрын

Not disappointing at all. Pretty cool to start with no information at all and start building out all of the info that you've already collected. The collaborative effort that comes into play makes stuff like this even better as information that would never see the light of day suddenly stands out when people realize there is a "market" and that it's not dead technology.

@5nowChain5 Жыл бұрын

In the London UK area (86-91) we used to use Northamber (located just off the A3, near Kingston) who used to repair all industrial computer hard drives and floppy drives of all sizes, including the ones for ancient Mainframes with the early huge Cabinet harddrives.

@cheapasstech Жыл бұрын

I found the hokushin-Yokugawa in a lot of HP documents- they were a distributor for HP computer systems in Japan. Probably even a subcontractor for parts - that might be an HP interface on that card! As they were merged - there appears a link with DEC as well

@NearFarMedia Жыл бұрын

Hewlett Packard and Yokogawa (YEW - Yokogawa Electric Works) worked together to make quite a number of pieces of electronics test equipment in the 80's too, often branded as YHP or Yokogawa Hewlett Packard, so this would make sense. (Incidentally Sony and Tektronix were making electronics test gear together during the same time too).

@TKomoski Жыл бұрын

This reminds me of the time I bought an IBM 10mb MFM hard drive back in the early 80's. I little smaller then that but it had a full length ISA card. Back then I used Stacker hard drive compression to double its capicity. Thank God those days are over, Happy Holidays to you and yours *Cheers*

@DavidRavenMoon Жыл бұрын

That drive is HUGE! Was probably very expensive. I worked for a graphics company in the early 90s that had a big Scitex computer system with big 2MB drives like this. And tape backup on reel to reel. Looked like something from a movie.

@Birb_of_Judge Жыл бұрын

I wonder how people during that time would have reacted if you told them that you can buy a 4TB 3,5" hard drive for under 100$.

@DavidRavenMoon Жыл бұрын

@@Birb_of_Judge I was so excited when I got an external 1GB SCSI drive for my PowerMac 6100! Lol. When I got that in 1994 I added 8 MB of RAM for about $800! Then prices came down and I sold that to a co worker for like $300 and bought 16MB for $700! And don’t get me started in my $600 Iomega Jaz drive!

@8bitwiz_ Жыл бұрын

Quick hint for disassemblers: 11K is 8085 code 0000-07FF 12K is 8085 code 2000-2FFF (same address space as 11K) L15 is 8085 code 0000-07FF

@lohphat Жыл бұрын

I worked for a systems integrator which specialized connecting SASI (SCSI precursor) to TRS-80 Mod II systems as we had one of these 8" drives -- it was either from Ricoh or Hitachi and I still remember the spin up sound almost 40 years later. IIRC it was a 300-350 MB drive. It was "huge" for its day.

@unmanaged Жыл бұрын

Hokushin Denki later became Yokogawa-Hokushin Denki, and now called Yokogawa Electric...

@aCivilServant Жыл бұрын

I remember some of the IBM servers we had used an option via the SCSI controller to either start up the attached SCSI drives instantly, or used a 'cascaded' start up based on the drives SCSI ID. This allowed them to start up one by one and reduce the load on the PSU. Pure speculation, but perhaps this drive is only programmed to spin up when it receives the correct command from an attached controller / host rather than when it's simply switched on?

@DiskWizard001 Жыл бұрын

This option varies on different controllers . Remebering SCSI drives - there was a jumper option to enable/disable disc behavior on power on.

@billmiller4800 Жыл бұрын

Since the start current on drives this size was massive, sequential start was important to not blow a breaker or smoke some wires. I have an old 5.25" SCSI that takes 15 Amps to start (at 12V) and is like a jet engine as it winds up, and this thing is even bigger, so I don't doubt the external start signal required. I worked with an old NCR mini in the 90's, and its power supply was good for 200 amps at 12V for the 4 drive chassis expansion module, running off 220V. That monster cabinet was something like 300 lbs and about the size of a large tower PC of the time to house 4 drives.

@Bob-1802 Жыл бұрын

About 110 chips on the top board. Almost as many on the other board, this accounts for about 200 chips. Can you imagine these were most likely installed by hand before going to the soldering wave.

@Farm_fab Жыл бұрын

I visited a trade school where the computer lab had one of these. The instructor said he wanted to build a laptop with it. I had one similar to yours back in the mid 80's. I worked near a computer manufacturer that was competing against IBM, and found a lot of goodies in their trash dumpster, including the HD.

@wowassault Жыл бұрын

Respect for including measurements like Kg as a sidenote on the screen, don't see allot of youtube channels puttin in the extra effort nowadays, keep it up Adrian!

@russellhltn1396 Жыл бұрын

The voltages seems a bit wonky. TTL chips need 5V +/- 0.25V. So, 4.7V is too low. You might want to adjust the 5V supply to 5.1V to allow for power loss in the cables/traces.

@benbaselet2026 Жыл бұрын

if 5.25 is upper threshold of the spec then it should be safe to go around 5.3 on the PSU end from the start.

@connecticutaggie Жыл бұрын

Ah, the TMS2516, I recall when that was released and I know the story... or at least the outside view if it. The story starts first with Intel's first EPROM in 1971 - The 1702 2Kbit UV erasable EPROM. The was followed up in 2704 and 2708 in 1975. They revolutionized development since you could reprogram your ROM. Soon everyone (including TI) started copying it and racing to see if they could beat Intel to make a 2716 before they could. The one annoyance with the 1st and 2nd gen EPROM is to use them you needed more than just 5V. Well, Intel surprised EVERYONE when they introduced their 2716 which was 5V only (for reading). Also, it could reuse those supply pins for address pins so the 2716 an 2732 could use the same 24-pin package as the 2708. That made TI's 2716 inferior and incompatible with Intel's 2716 which forced it to change its part number. The TMS2516 was TI's "copy" of the Intel (5V only) 2716.

@rakslice Жыл бұрын

The terminator pack you're looking at 41:26 is on the board directly connected to the drive, right? I feel like there is confusion here, if anything here is going to be a peripheral bus like scsi/sasi it's not going to be that, it's going to be the connector that goes from the other board -- presumably the drive controller -- to (whatever host adapter installed in) the computer. Like think about how ST506 drives were used with SCSI using ST506 to SCSI drive controllers like ACB-4000A you would then connect to your scsi bus, and those are later more miniaturized 5 1/4" hard drives.

@mfree80286 Жыл бұрын

It's a proprietary bus from Priam, an NRZ serial type.

@stephaneneron Жыл бұрын

Nice video. Its hard to uncover anything about these old piece of computerright from another era where the was no INTERNET :) BTW I love that TRS-80 plate on your monitor :)

@Renville80 Жыл бұрын

Some of those older linear supplies used a honking big transistor in a ‘series pass’ configuration, and the actual regulator is a LM723 IC or similar.

@PileOfEmptyTapes Жыл бұрын

Yeah, very common setup for lab power supplies back and such in the day. Fun fact, the trusty '723 actually has a really low-noise voltage reference even by modern standards.

@DelmarToad Жыл бұрын

Did you try the ST506 interface adapter (Adaptec brand?) like used for old Winchester drives?

@ForgottenMachines Жыл бұрын

Awesome video, as always! 27:33 There's a 4th option, I'm certain has already been discussed. Just sticky bearings, that often can be freed up by giving the chassis of the drive a quick and sudden "spin" by hand, in the direction perpendicular to the drive motor axle. Of course, this is easy with a 5.25" drive, much harder with an 8", but there's always a way! Has this been tried yet? Well, moving ahead to 30:38 I can see that you've ruled this out, as you've exposed part of the drive motor, and you could just spin it by hand there and see if it moves freely...and you've determined that the BLDC circuit is not even trying to spin the drive...anyway... LOVE this stuff, Adrian...we'll get the flux transitions off of this device yet for you!!!

@scottlarson1548 Жыл бұрын

In 40 years of owning computers, I've never owned a computer that had as many chips as that disk drive.

@Rx7man Жыл бұрын

when you ask "How complicated can it be to put 1's and 0's from the data bus onto physical media... well, this is the answer! Also interesting is the clock speed seems to be competing quite well with the clock speeds of the computers it was hooked up to!

@scottlarson1548 Жыл бұрын

@@Rx7man The Ohio Scientific floppy disk interfaces were nothing but a PIA (6821) to control the head and a serial adapter (6850) to read and write the data. There was also a "data separator" to remove the clock from the data stream, but that was it! Three main chips and everything else was done in software. Hell, it wasn't much more complicated than their cassette tape interface.

@Andreas_Straub Жыл бұрын

I had one of those 8" disk drives about 30 years ago. It used a SASI interface - kind of a predecessor of the SCSI interface coming several years later on the market. It should be realtively simple to interface to a parallel interface. I remember we added such a drive to a Motorola Exorciser at that time and running Versados from it.

@geoffreed4199 Жыл бұрын

Shugart Associates System Interface, was either (0.5 or 1.0 MB/sec) then 2.5 MB/sec IIRC SCSI -1 was essentially the same interface at 5.0 MB/sec, Fast SCSI 10.0 MB/sec there are some older SCSI controllers that could be clocked down to SASI speeds to migrate your data off the old drives, or continue using them, but that wasn't technically supported.

@joejohnson8132 Жыл бұрын

I'd really love to see an update on this now you have more info! Would be great to access the disk.

@jaredwright5917 Жыл бұрын

I'm curious whether or not the serial outputs on the 8085s are used for anything. They'd be great for diagnostic output in something like this.

@tjs114 Жыл бұрын

In the mid-1980s, we had Hokushin hard drives - 5mg and 10mg attached in an outboard cabinet to a hot rodded MicroVax and the interface was Shugart ST412.

@richardchambers256 Жыл бұрын

Milligrams? Thanks Doc! 😆

@grahambird1570 Жыл бұрын

I worked at British Airways as an HVAC Engineer, 21 years ago at their Data Center area, at Bodicia Hse. In the background on this Huge site there were a couple of Condemned Buildings, one of them was called Comet House, which was infact the Airway Staff Medical Center and Hospital. The Building had been 'Ear Marked' for Demolition but there was alot of Politics involved because of Asbestos Presence and was Boarded up. But, we got through the Boarding and went on a journey of discovery. Now, me being interested in Computers and Technology found a Redundant Storage area of Dozens of old Form Computers, Boxes and Boxes, lines and lines of shelving containing electronic components. Now, I saw a few dozen of the Hard drive and boards that you are exhibiting. They certainly weren't screwed to a Board like yours and were in a Proper or appropriate Container in a similar configuration to the Machine you are showing us. I noted the 50 Pin configuration and here you have revealed this to us. Apparently the PC's then were used for and by the Pay Offices and Staff Records.

@uni-byte Жыл бұрын

SASI = "Shugart Associates System Interface"

@MurderMostFowl Жыл бұрын

After buying my son a 512GB Micro SD card for Christmas for $49 to replace the 32GB one he had and promptly threw away really puts 10MB in perspective

@wb5mct Жыл бұрын

The speed sensor is very likely a variable reluctance type, as evidenced by there being only two wires feeding it. (Hall devices require power). Variable reluctance sensors are a essentially a magnet inside a coil of wire that generates an AC voltage when a ferrous metal comes closer/farther away. Very simple and robust!

@RyanUptonInnovator Жыл бұрын

Great video. Those old drives can sometimes take a long time to start, like 15mins. Maybe you are switching it off too quickly before it has a chance to properly execute the startup sequence.

@donaldcongdon9095 Жыл бұрын

That no-code ROM could implement a drive control state machine.

@benbaselet2026 Жыл бұрын

I was thinking it might contain a hardcoded bad block map or something. It would be a pain to update it but I guess it's still doable.

@robertharris2262 Жыл бұрын

Drat, I should have read further down the comments. Said basically the same thing higher up this list. Custom 8086 computer accessing SASI drive via special controller with state machine implemented from 4 x 4-bit PROMS. Hell on earth to troubleshoot

@CapStar362 Жыл бұрын

nice breakdown - note: That Black and Orange DMM - i have the slighter higher model with the backlit screen and NCD Mode. Non-Contact Detection. Love that thing, its hyper responsive.

@llYossarian Жыл бұрын

Heya... I've got those same Bose desktop speakers and I've been _dying_ to get a 2.1 setup but I've heard that even with a subwoofer, the overall bass quality _(on cheaper models)_ is worse than the Bose 2.0. -- Do you also have a 2.1/could you comment on your preference?

@michaelallen1432 Жыл бұрын

Many years ago I read the user manual for an 8-in Enterprise class hard drive. It was a little newer and a completely different interface. It was something called SMD however, one of the jumpers on it determined whether it would power itself up when you turn the power on or whether it required a command to start and what sequence they would start in or something like that

@exidy-yt Жыл бұрын

This huge clunker reminds me of the 20mb SCSI drive I bought for my Amiga 500 in the mid 80s. It was in it's own big box like Adrian's, connected by a ribbon to a sidecar that attached to the Zorro slot on the side, unlike the Commodore or GVC brands that were card and drive in the sidecar. The heads were driven by a stepper motor not a voice coil, and it was loud as a vacuum cleaner and typewriter combined when running, you could hear the beast 2 rooms away, and there was some kind of conflict where if you installed the boot ROM into the sidecar, it took over 30 seconds of gray screen before the thing would begin to boot. It was faster to boot Kickstart from floppy and use the HD purely as storage. Those were the days, my friends.

@tubical71 Жыл бұрын

my first HD was a MFM 20MB drive i had for my A2000 came with a proprietary PC MFM controller which then was hooked up to another board which had a little contoller and two roms on it to translate the XT bus from that MFM card to the zorroII bus of the Amiga, it also had drivers for the ISA bus as well for the amiga and it also was bootable (!!)and it was fast back than.i measured 2.8MB/sec that was about trippled compared to what i could read on the PC side using a A2286 and also an AT computer.....and it was about 500bucks total. i later added another 80MB MFM drive and then i bought a A2091 and finally a GeForce 040/33 with its own scsi....all in all 15grand for a computer system...think about what you wpuld get for 15grand today....those had been the days of geeky hardware used by geeky people to get things up and running....;)

@exidy-yt Жыл бұрын

@@tubical71 I really miss those times, sometime. It was a great time to grow up loving tech.

@twocvbloke Жыл бұрын

Haven't a clue how to make it work, it's just one of them things that's fascinating to see cos it's the kind of computer hardware that we wouldn't get to see outside of some then-high tech industry where they were fancy with all their computer terminals and a room dedicated to a mainframe with walls of computery stuff that looked like some movie set... :P

@scsirob Жыл бұрын

Some of those bit patterns in the 12E EPROM might be a discrete state machine. There's quite a few 74LS273 latches there, it might be a discrete CPU-like circuit. I used to work for Intergraph who used huge boards with similar technology for graphic and disk processors.

@wlbrobinson 11 ай бұрын

I worked for intergraph in the 80's and 90's, fujitsu made a drive like this and so did CDC. These were the standard replacements for the much larger CDC washing machine size drive, in 1982 they were 80 MB in 85 they were 300MB and the units you have in the video would fit side by side in a 19" standard rack, 300 mb each. It was a big jump in tech as a small room could hold a pretty powerful computer for the time.

@timballam3675 Жыл бұрын

Seen some scanned Priam documentation on a polish site but they want payment for the PDFs they must be available elsewhere?

@lemon3rd800 Жыл бұрын

Not disappointing at all; you made a lot of progress finding possible errors or failures and open spots.

@Fuzzytubby Жыл бұрын

Happy Christmas Adrian! As someone who used to fix (Now considered old) computers for a job and now does (Z80) machine coding as a hobby I really love your channel! Just keep doing what you are doing and I will remain in awe with all you content. Wishing everyone on the planet a saner and more sensible New Year. Greetings from the UK (Brexit is a disaster and I never voted for it...)

@Raintiger88 2 ай бұрын

Wow. . simply amazing. It's amazing how far we've come in such a short period of time. I was watching a retro mac channel the other day and they showed a page from an old mac "stuff" magazine that I likely spend tons of money and even though I vaguely recall, I'm still amazed at how far we've come. (PS: March 1984, I was a junior in HS but still on the ][+ but loved that computer). No HDDs and carried around a box of 5.25 disk just like all the other nerds.

@Alex-je6od Жыл бұрын

I feel like everything is actually working as it should be. You just need to issue a spin-up command to start the drive. SCSI does something similar. (1B START STOP UNIT)

@DavidGalich77 Жыл бұрын

Good luck with that monster! LOL :) Happy Holidays.

@JacGoudsmit Жыл бұрын

You already found out that the device probably needs a start command, but the cascaded startup that you talked about to avoid a spin-up from tripping the breakers, was often a matter of simple wiring. I owned some rack mounted hard disks connected to a Prime mini computer, and if I remember correctly they simply had some connection between them that would link a "spin up" input of one drive to the "running" output of the previous drive. There were dip switches or jumpers on each drive that allowed you to choose between spinning up (1) at power up, or (2) hard spin up via the cascade wires between drives, or (3) soft spin up, i.e.with a command from the interface only. I doubt that it helps but maybe it's useful to keep in mind for another time. By the way the drives that I had were enormous, they weighed 56kg each (I remember there was a sticker on the back side) and the spindles were powered by a big AC motor. I didn't have a car and took one apart to transport it in pieces, on the bus. Fortunately after one trip I got help from a house mate who did have a car.

@rajatanpacelana Жыл бұрын

Merry Christmas Adrian and everybody that is watching this channel....

@damiengirvan5020 Жыл бұрын

Would the pictures you looked at on eBay not be in your temporary internet files folder??? Or does windows not do that anymore???

@aggonzalezdc Жыл бұрын

Could the repeating code you observed be a wait command? As you mentioned, some of these drives only spin when instructed to, so could that not just be a wait cycle?

@NEEC1 Жыл бұрын

Hi Adrian, it looks to me as its primed and ready to go. The psu rails look good and the buss looks correct. I guess once the interface is plugged in to an appropriate card at the PC end, the drive will get its activation signal and start spinning. And yes, reversing those roms without any i/o or memory mapping data would be tricky indeed.

@williamgraham2468 Жыл бұрын

I built a homebrew i8085-based system. The instruction set is the same as the i8080A, with two additions: RIM and SIM (read/set interrupt mask). ROMs can also be used to make a state machine. Do some of the data lines wrap back to the address lines? It might be decoding a raw bit stream from the disk into data bytes. See Woz's Disk ][ interface design for example.

@agranero6 Жыл бұрын

I had a strange feeling watching this video: once you mentioned Hokushin, the first thing that came into my mind was Yokogawa, I don't know why. Later when you mentioned it was absorbed by Yokogawa this kept me thinking if there was something in the bottom of my mind that made me think if I read something in the past about it or it was because the name Hokushin Electric Works made me remember Yokogawa Electric Works (more know by YEW) as it advertised in the 80's.

@Edricofifrit Жыл бұрын

This is crazy! When I was a kid,my dad had one similar to this(just remember that it was hokushin), it only worked with this arcane setup called SPARTAN, iirc it was to run AIIe on C64, or some such. I do remember what it was for, though. My dad had all his Wizardry disks in the thing. I remember it being a humongous pain in the butt to boot, had to select partitions with dip switch, etc! Cheers!

@danaeckel5523 Жыл бұрын

This is cool, I would love to see what kind of os is stored on this drive or applications. Honestly if you were to get rid of thing hit up Usagi Electric's channel I would love to see the saga continue. Maybe this could be something he could add to his PDP-11 or his Centurion projects.

@pikaskew Жыл бұрын

Really wish I kept mine…had a huge Maxtor like this back in the early 2000’s. I think it was from the early 80’s. You could really hear it spin up from across the room :) One thing I noticed about a lot of drives from this era, there were often labels attached to them with running stats, known problems, bad sectors etc.

@machdaddy6451 Жыл бұрын

I worked at 3M Camarillo, where for a while we made an eight inch hard drive. This is not it, however it is similar in dimensions. Their capacities were twenty and sixty megabytes. The motor was a brushless motor. When the project was abandoed, I was able to get one.

@ropersonline Жыл бұрын

29:45: I suspect PSD is for power supply, DC, but I could be wrong. Another guess is power supply, dual (as opposed to PSS, power supply, single). Does that circuit board output anything other than DC? Does it output two voltages?

@Penfold8 Жыл бұрын

That looks like an IDE cable. I was actually thinking you were going to have an MFM cable when I saw the size of that drive.

@enzofitzhume7320 Жыл бұрын

Have you checked for continuity on the coils to the spindle motor?

@AureliusR Жыл бұрын

Yeah, combinatorial logic in PROM was a very common trick back then. You use the address lines essentially as logic inputs, and the data lines as logic outputs. You can shrink a lot of 74 series chips into a PROM this way if you're clever about it. The result of course will be *very* random looking until you understand the logic function going on. I might take a poke around in that PROM and see if I can't figure out the logic equations used.

@FernandoChaves Жыл бұрын

Fascinating. I have found much info searching eBay listings and blowing up pics found there. If the item is sold you can still search completed listings for it! I was very frustrated for you at 32.00! I have actually contacted sellers to get additional pics of items and/or documentation even after an item has sold. In most cases they have obliged. I call it "mining" eBay for technical info (maybe not an original term, LOL!). Once a seller even contacted a buyer for me to ask if they could give contact info to me to pursue technical data on an item. It worked!

@salipander6570 Жыл бұрын

Adrian, do you take any ESD measures? It seems you touch all those old sram RAM chips with your fingers while moving around. This could damage them.

@Derundurel Жыл бұрын

I wondered about that too.

@craigtiano3455 Жыл бұрын

IIRC, the 8" SASI drive in my S-100 machine in the early 1980's had a jumper that controlled whether the drive would start spinning on power up, or whether it should wait on a signal on the SASI bus (RST?) to start. The S-100 cpu board had a 40 pin connector that went to a SASI paddle board which went 50 pins to a WD controller, that went to the drive. I only had one drive, so I can't comment on whether it cycled one drive up at a time. The cabinet this was in had space for two drives. The single 8" HD I had installed had its own plug that went into a power strip inside the cabinet, so one could easily replace the power supply for the drives separate from the power supply for the S-100 bus itself.

@danielmantione Жыл бұрын

What we are looking at here were the business computers of the 80s. People did still love and cherish their home computers after the 80 bit era did end, because they causes so many great moments for people. This wasn't the case with the business computers; once companies bought better computers, the old ones were turned into trash. There was no one trying to preserve the documentation because nobody had any love for those big machines. Especially proprietary hardware was simply erased from history. It's kind of a problem: When in say, 200 years people dive computer history, they will find a treasure chest of well preserved 8-bit computers and enough video on KZfaq to spend years of time. However, the 80s were also the great decade of mainframes. Next to nothing has been preserved and this will result in a wrong picture of history.