Troubleshooting RS422 on the NABU Personal Computer
Рет қаралды 7,862
6 ай бұрынPCB used in the video here: www.pcbway.com/project/sharep...
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Support me on patreon.com/Epictronics
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Tools I regularly use
DeoxIT D5 Contact Cleaner
Hanstar 861DW Rework Station
Pro'sKit SS-331 Desoldering Station
UNI-T UT61E Auto Ranging Multimeter
UNI-T UT890D Manual Ranging Multimeter
MESR-100 mk2 ESR meeter
PINECIL Soldering Iron
PinePowerPSU
TS-100 Soldering Iron
AMTECH NC-559-ASM Flux
Kester 951 Flux pen
MaAnt Grinding Pen
Multicore 60/40. 0.38mm and 0.5mm solder
TL866 II Plus Programmer
RIGOL DHO800 70MHz four-channel digital scope
Tektronix 2246A 100 MHz four-channel analog scope
InfiRay P2 Pro Thermal Camera
PCBs from PCBWay.com :)
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patreon.com/Epictronics
Join me on Twitter: / epictronics1
Music by Karl Casey @ White Bat Audio
@Epictronics1 6 ай бұрын
Support me on patreon.com/Epictronics Join me on Twitter: twitter.com/epictronics1
@grybsh 6 ай бұрын
Deoxit is a NABU owners best friend. Welcome to the 1983 😁
@Epictronics1 6 ай бұрын
That can of magic has saved many of my vintage computers :)
@kreuner11 6 ай бұрын
Ten years before the world wide web, not the internet per-se
@maxtornogood 6 ай бұрын
The only people "banning" you expect absolute perfection everytime. I'm certainly not one of them! 😉
@Epictronics1 6 ай бұрын
Luckily, everybody makes mistakes :)
@alisharifian535 6 ай бұрын
IC chips are not pulled from old machines. They come out of factory pretinned so they can be soldered easily,according to some old datasheets.
@humidbeing 6 ай бұрын
Most of those USB UART cables don't put out enough voltage swing for older serial comms stuff to work. They'll work with stuff from the late 90s/early 2000s.
@Epictronics1 6 ай бұрын
ok, I'll check the voltages, thanks
@tekvax01 6 ай бұрын
The +ve TX phase of the RS-422 signal can be used as the RS-232 TX line, however, you must route the TX to the RX of the other port. You need not connect the -ve phase of the RS-422 signal to anything, just leave it disconnected. Remember DCE and DTE are your friends with serial communications protocols!
@Epictronics1 6 ай бұрын
Interesting. I may try that out, thanks
@jdmcs 6 ай бұрын
Great to see another NABU up and running!
@Epictronics1 6 ай бұрын
A bit late to the game lol. I have some catching up to do :)
@POVwithRC 6 ай бұрын
Bjork TV teardown reference NOTICED.
@networkg 6 ай бұрын
Skyscrapers found in ancient Canadian computer !!! at 14:49
@derekchristenson5711 3 ай бұрын
Nice! I ran into similar issues when trying to get mine connected to a modern computer, then I realized that I had read the pinout of the serial cable backwards and was connecting TX to TX, etc. Oops. Rewired the custom cord, plugged it in, and it worked right away! (I've heard that I'm not alone in this mistake.) I'm not saying that was your issue with the RS-422 cable, but it was mine. I'm glad you got it working with the USB to TTL serial adapter! 🙂
@Epictronics1 3 ай бұрын
Thanks. Glad to hear you got it sorted. Sometimes, the RS-422 cable is incorrectly marked too
@tony359 6 ай бұрын
so cool that the community managed to put this project together! Thanks for the video!
@Epictronics1 6 ай бұрын
The NABU community is awesome!
@RudysRetroIntel 6 ай бұрын
Nicely done! Now you can have some NABU fun.Thanks for sharing
@Epictronics1 6 ай бұрын
Thanks Rudy! Looking forward to exploring the weird and wonderful NABU
@JamiesHackShack 6 ай бұрын
Yay! Glad to see you back hacking at the nabu! Nice scope too!
@Epictronics1 6 ай бұрын
Thanks!
@TheRetroRecall 6 ай бұрын
Hahah the chips are upside down so the bits are falling out.. 😂😂. I'm stealing this!!! You rock!
@Epictronics1 6 ай бұрын
Everything on this channel is up for grabs haha
@TheRetroRecall 6 ай бұрын
@@Epictronics1 haha! Roman, you always do amazing work, always excited when one of your videos come out. Hopefully I'll get to your level of troubleshooting some day. Looking forward to more happy caps, get the green pen out!
@Epictronics1 6 ай бұрын
@@TheRetroRecall haha, thanks! I actually just received a large box of happy caps from Mouser :)
@blueduck577 6 ай бұрын
Man, that CRT whine! Does anybody else hear it!?
@itsonlycayle 6 ай бұрын
Great video
@Epictronics1 6 ай бұрын
Thank you
@windows1.0 6 ай бұрын
I really like this video
@Epictronics1 6 ай бұрын
Thank you :)
@cbmeeks 6 ай бұрын
I've never seen SMD capacitors mounted on their sides like that. At least not from the factory. Very interesting.
@Epictronics1 6 ай бұрын
Bjork would have been impressed ;)
@SidneyCritic 6 ай бұрын
I think in the old days they used solder to protect the pins because gold wasn't that common, ie, it was more expensive. I remember ISA cards with solder edge connectors.
@bikeforever2016 6 ай бұрын
Solder (leaded) is also soft compared to the connector parts. Each extraction and insertion removes a layer of solder, exposing a new piece to make a new conecttion.
@BilisNegra 6 ай бұрын
Wait, is gold more common or less expensive now? 🤣Ok, ok, you might mean gold plating techniques were.
@leonkiriliuk 6 ай бұрын
The RESET button on the NABU doesn't work the same as on a PC. It just sends the reset signal to the CPU, it does not reset the entire computer. Always use the power button on the NABU to do a proper reset.
@Epictronics1 6 ай бұрын
I'll keep that in mind, thanks!
@Wormetti 6 ай бұрын
I was waiting for this video ever since your first NABU video. Good to see you got it working. I'm still curious why it's not working with your RS422 adapter. Arctic Adventure works fine for me and loads fast.
@Epictronics1 6 ай бұрын
The Arctic Adventure fail may just have been a glitch. I'll try to find some time to test the system more extensively. I'd love to do some more tests with the RS422, but I kinda ran out of things to try
@thebishtable 6 ай бұрын
Just a wild guess, but I've seen certain UARTs struggle with non-standard baud rates. The UART in the RS422 adapter you were using may be one of those. You could try measuring the pulse width of the of the TX (from the PC) and compare it to the pulse width of the signal from the NABU and make sure they are close. If that doesn't, try flipping +/- on the RS422 lines. :)
@Epictronics1 6 ай бұрын
Thanks. I have tired to flip the +/-. I have an idea on how to test if the RS422 cable can handle the weird baud rate
@alanarmstrong2323 6 ай бұрын
Thanks!
@Epictronics1 6 ай бұрын
Thank you :)
@alanarmstrong2323 6 ай бұрын
@Epictronics1 I have a nabu but it is still in sealed box just waiting for some to come out with a cat 5 connector for it
@Epictronics1 6 ай бұрын
@@alanarmstrong2323 I'm surprised that wasn't the first project to come out for the NABU. There are way more advanced projects done, but I don't think there is a simple NIC and a proper online server for it yet. Let's hope someone is working on it 🤞
@alanarmstrong2323 6 ай бұрын
I got into puters way back in 81 using an ibm 360 using forscan and pascal The first modern computer lol trs 80 using tape backup,very interested in this computer using the z80 processor .
@Epictronics1 6 ай бұрын
@@alanarmstrong2323 Oh, I dream about one day owning something like an IBM 360! I actually have a picture of an IBM 360 tape drive as my desktop wallpaper :) I only got into computers as a kid in 1985. Commodore 64 with a tape deck and a 14" TV. The closest I ever got to the Z80, before getting the NABU, was a Commodore 128 lol.
@Mueller3D 6 ай бұрын
From watching other Nabu videos, some folks have had issues with how their adapters deal with handshaking settings. RS422 doesn't have hardware handshaking, but the PC thinks its talking to an RS232 port which does have hardware handshaking. Some adapters just pretend the handshaking is always saying "go", while others might require a setting to do that. Not sure if the server software is dealing with this.
@ovalteen4404 6 ай бұрын
As far as I can tell, 422 doesn't have any start/stop bits. At least, every site I look doesn't mention one. I think that a differential signal of 0V is considered to be "not sending". Once it goes to differential signals, it would seem that all bits are significant. I think the same is true for USB, but with the difference that 1's indicate toggle and too many of the same bit require a stuffed bit for clocking.
@Epictronics1 6 ай бұрын
I will be able to confirm this if someone decodes what key I typed :)
@OscarSommerbo 6 ай бұрын
A network card should be easily accomplished with an ESP32 or and Arduino. Since you already have a serial connection in the Nabu.
@Epictronics1 6 ай бұрын
Great!
@TzOk 6 ай бұрын
You can use the NORMAL triggering mode on the scope. This would be more convenient than SINGLE.
@Epictronics1 6 ай бұрын
well, I tried that. The signal just flashed by occasionally
@TzOk 6 ай бұрын
@@Epictronics1 It flashes on AUTO. Normal doesn't refresh when there is no trigger. There is also an option to suppress triggering for a given time after a trigger had occurred.
@Epictronics1 6 ай бұрын
@@TzOk Ok, thanks!
@DAVIDGREGORYKERR 17 күн бұрын
What about a 68B54 like that used in the BBC Model B.
@8antipode9 6 ай бұрын
Nice one, Roman. Guess I'm lucky that the NABU and serial cable I bought all just worked with a little bit of fiddling. I just love that keyboard! It is a little huge though, I'm currently trying to figure out display/storage for my computers, and things like the NABU and my iMac G3 are kind of difficult to find places for.
@Epictronics1 6 ай бұрын
Thanks. That is quite funny actually. I have been seconds away from buying G3s several times. Every time I think -Where am I going to put it? so, no G3 yet lol. +1 on that KB btw!
@8antipode9 6 ай бұрын
@@Epictronics1 My G3 was definitely a "pity buy". Stuck on eBay and reduced in price several times. I finally bought it because I didn't want to see it going to the dump.
@tbbw 5 ай бұрын
wonder if the nabu would be a good candidate for one of them esp mods... hmm...
@douro20 6 ай бұрын
111861 bps is a very strange bit rate.
@Epictronics1 6 ай бұрын
It sure is. DJ Sures did some math and managed to figure it out somehow
@heilong108 6 ай бұрын
I'd guess that RS-422 dongle simply doesn't work properly at non-standard baud rates
@AWalYT 6 ай бұрын
It's a shame this one didn't just work out of the box. With the amount of vintage things I'll get that require some significant effort just to get running I was pleasantly surprised when I soldered together a cable for the serial adapter then plugged it into and turned on my Nabu computer to find out that everything "Just Worked." Regardless, I am a fan of how this computer looks as well since it blends in well with other TV accessories.
@Epictronics1 6 ай бұрын
Well, now we got to play with RS422 :) that was fun!
@DAVIDGREGORYKERR 17 күн бұрын
If only there was a RTS connecting to the CTS and DTR was connected to DCD and THRE then things would work would they not.
@gsestream 6 ай бұрын
you mean corporate lan :)
@justinthomas2458 6 ай бұрын
I still haven't opened my nabu!
@Epictronics1 6 ай бұрын
You should!
@OscarSommerbo 6 ай бұрын
I fail to see the fascination with the Nabu computer. Sure, it is quirky and 8-bit, but that really doesn't merit the frenzy I've seen on KZfaq.
@nickwallette6201 6 ай бұрын
I think it's partly its obscurity. This whole concept was quite an undertaking, actually got funded and rolled out to subscribers, and then ... vanished. About 40 years later, a warehouse of them is found, still brand new in box. This weird, quirky project featuring a computer nobody's heard of... it's a neat story. It hit the popular retro channels, and spread like wildfire. I got one because I thought, hey this could be fun to develop for. It's got a really nice keyboard, a solid-state storage system (network interface), and an architecture based on parts that are pretty well documented. Could be fun! Also, I'm experimenting with cable head-end stuff, so it's kind of up my alley.
@tigheklory 6 ай бұрын
Dexoit is amazing stuff, can I convince you to get some Deoxit D100L in the needle bottle? It is 100% solution instead of the 5% you are using, which is diluted with mineral oil. The 100% solution works faster and better. Also, I want you to try out a Coleco Adam computer with a FujiNet adapter!
@Epictronics1 6 ай бұрын
Thanks for the recommendation. Maybe, I'll try it, but it's very pricy!
@tigheklory 6 ай бұрын
@@Epictronics1 Yeah it's not cheap, but keep in mind there is only 7.35ml of deoxit in a 5oz spray can. There is 25ml in the D100l-25C bottle. It works out to $2.31/ml for the D5S and $1.20/ml for the D100L-25C. You use a lot less as well and you have less of a mess when you are done.
@johnathanjamesjohnsonjr7408 6 ай бұрын
...👏👍🖖 2:24
@Tommi-C 6 ай бұрын
Hello, I am from 1984. Can you please explain exactly how you did that? Please do not ask how I seen your video from the past? 😊
@nickwallette6201 6 ай бұрын
I wonder if anyone knows anything about the provider side of this? It would be interesting to get the network adapter working, too. Not sure what kind of modulator that it would use, though. Anybody ever document that part of it?
@Epictronics1 6 ай бұрын
I'm trying to buy the NABU adaptor unit so we can explore it. Unfortunately, they are way overpriced on eBay
@killerbee2562 6 ай бұрын
Is there a way to build the server into the NABU? Say with a raspberry pie or fpa emulation?
@Epictronics1 6 ай бұрын
Yes, I think there is a raspberry pie server
@2dfx 6 ай бұрын
Any reason you chose the DSO802 over say something more utilitarian like the DS1102E?
@Epictronics1 6 ай бұрын
I didn't look into the DS1102E. What would be the benefit compared to the DSO804?
@2dfx 6 ай бұрын
@@Epictronics1 upon looking at the 2, you made the correct choice in the DHO804. Needed a new scope myself!
@archivis 6 ай бұрын
:)
@Wormetti 6 ай бұрын
It seems like your NABU still has some issues. The fire graphics are corrupted at 24:05. Maybe need to deox more chips.
@Epictronics1 6 ай бұрын
Thanks for letting me know!
@charlesdorval394 6 ай бұрын
lmao I socket my FTDIs for the same reason
@Epictronics1 6 ай бұрын
yeah, I seem to need one when I least expect it
@ejstacey 6 ай бұрын
letter "s"? 😁
@The_Traveling_Clown 6 ай бұрын
Didn't the French internet came before the NABU???
@Epictronics1 6 ай бұрын
The French internet?
@AWalYT 6 ай бұрын
@@Epictronics1 I believe he is talking about the Minitel network. It was a way for French citizens to get information using a special terminal (I believe it was called a Videotex) before the world wide web.
@The_Traveling_Clown 6 ай бұрын
The MiniTel @@Epictronics1
@bikeforever2016 6 ай бұрын
Minitel
@Epictronics1 6 ай бұрын
@@bikeforever2016 I'll do some reading, thanks!
@Retroman8077 6 ай бұрын
Yeah u gotta work on learning your scope better
@Epictronics1 6 ай бұрын
sure, where did I go wrong?
@mattl_ 6 ай бұрын
The Internet was already a thing in 1982. Are you referring to the web?
@Epictronics1 6 ай бұрын
I was struggling a bit with how to present the NABU network in one short sentence. (that's all we KZfaqrs get) You are technically right, but there were only around 200 users of the internet in 1981. I wasn't able to find the number for 1982.
@mattl_ 6 ай бұрын
The 1981 figure of 200 is 200 computers, not people. One of those computers would have had many dozens of users.
@mattl_ 6 ай бұрын
archive.computerhistory.org/resources/access/text/2019/05/102683804-05-001-acc.pdf is a bit easier to read too.
@Retroman8077 6 ай бұрын
I bet he knew that answer before he made the video. His scope knowledge and soldering skills need attention. Pcbway got roused
@Epictronics1 6 ай бұрын
Enlighten me
@nickwallette6201 6 ай бұрын
Y'know ... the Internet has really ruined people. Everyone is so terrified of being the one that got bamboozled that they try to call shenanigans on everything, whether a conspiracy exists or not. This rampant cynicism is just sad to watch. Try being genuine and just accepting things at face value. You will get fooled sometimes, but you will live. And life is a lot more fun when you're not constantly trying to find out how every person you meet is attempting to screw you over.
@Epictronics1 6 ай бұрын
@@nickwallette6201 well said. I'm just as sick and tired of fake crap online as everyone else. I don't fake anything and I leave my mistakes in
@g4z-kb7ct 6 ай бұрын
@Retroman8077 LOL! Pretty typical comment from a classic noob. Where are your 1000's of vids showing how good you are? His scope knowledge might need work but his soldering skills are way better than most.
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