Trying to do this with two old rotary phones but have no joy, all you can get is hearing yourself in the same handset but nothing goes to the other phone??

Nice video but why do you put a line across your 0's? Confusing as it's a letter in some countries "ø/Ø"

According to this situation, I can still write a mixture of characters and digits like "1x" and it only processes digit. Can we prevent such situations? In other words, in case of digit + character, it should be considered as incorrect. second question is => I can enter almost infinite characters or integers from the keyboard. Does this cause a security problem? Thanks

4-Tracks, 8-tracks, 7 1/2 ips..it's all good

hi, these ptc fuses, I have here eaton PTS12066V050 (500mA) and bourns MF-NSMF050-2 (1A - these looks cool also ))), just because I saw them on some microchip nano dev modules; I feel that t Rmin is just minimal resistance and Rmax would be resistance NEAR that trip current - after which it just breaks, so to Terraohms ))) ...at least that is how I imagine resetable fuse, which probably needs to cool down to be again ready ... not used yet, but in case you design something with lion/lipo cells then dont have them can cause some neat physics/chemistry home experiments in case you short something .... for usb/powerbanks its probably short protected always :-) ... but, its possible these circuits on chinese cells are already preventing short circuit ... who knows ... not tried this;

Efinix has FPGAs with RISC-V cores in them.

how do people make "hot-pluggable" ps/2? just resetting it frequently so it will pick up a new peripheral within a given amount of time? i never understood how computers managed that

When you add the UART it would be fun to have an overclocking championship for the Z180. All of us with boards could post our top fmax.

This is the Optitekscope we use! Nice video brother!

Interesting video Mr. Basement. Definitely makes me want to do some more on the Nouveau project when I'm next able to.

If we are going to do this then we mustn't blow the code protect fuse so we can reuse the FPGA as FPGAs are not cheap at the minute but the price will come down once there is a large supply of FPGAs.

I added a USB memory Key Interface and MP3 Player to my Z80 Microbee using the FTDI VMUSIC module. It's very cool and handy!

PS/2 Keyboard interface can be done at two levels. The first being a unidirectional mode from keyboard to host; in this mode the keyboard LEDS won't work but the keyboard make and break codes are sent to the host. The hardware required is just a bit of fundamental penny logic. The second being a bidirectional mode is more functional but is more complex and is often done using a coprocessor such as an 8042. If choosing to use a coprocessor I'd go with a Cypress PSoC 5LP giving you the option of using either PS/2 or USB modes and even have their own internal programmable logic blocks.

Wiznet TCP/IP Ethernet offload modules are cool. I used them about a decade ago with Z80s using parallel I/O mode with great success. Apparently they're now even available in WiFi versions. The initial version came with a 2mm pin pitch. WATCH OUT!

have a look at the TN-VDP or PICO99 projects..

I think the iCE40HX4K chip used is not going to handle everything on this list, especially the VGA part of it if you want decent graphics output. A point of comparison is the VERA project with 5K LEs. It generates sound and graphics and has little space left.

As a person who drew buildings for a living for 12 years, i can tell you categorically that dimensions must be explicitly stated.

Does your HDMI chip not support audio over HDMI? With that you wouldn't need a speaker to play sound.

That's was both entertaining and educational. Thanks! ❤

Not watched all of it yet, but what about ethernet? (Maybe a lot of software development...but would be cool....)

I don’t know if you know but Ben Eater has a video showing the USB 1.1 fast mode on keyboards sou you could probably detect if the keyboard does PS2 otherwise „fall back“ to USB HID protocol in the FPGA implemented HID controller. I think this could be a fun project

John think about and I2C interface and SPI that handle all the protocol, so the z80 does not have to do bit banging. Also Micron MT29F4G01 4Gbit SPI flash memory, ~$4.00. this little chip has 512MB of storage in a 8mm x 6mm 8 pin dfn package. If you setup the SPI interface with 3:8 _CS_ decoder support it allows all kinds of maker expansion, displays, AD converters, GPIO, ... I'm laying out a Z180 board that will use a modified ROMWBW (bios ,, cp/m), found i needed more volatile and non-volatile storage 23aa04m or 23LCV04M 512KB SPI RAM (the LCV version has battery backup options). ROMWBW uses the Z180's ASI as the SPI interface, one issues is that the bit order is wrong for SPI, so you have to bit mirror each byte into or out of the ASI, I implemented a mirror in hardware so that a IN A,(nn) instruction is all that is needed to do the mirror op. I connected A[15..8] to D[0..7] thru a '573 . Chuck.

to be honest i think you could have taken the serial manifesto even further. the fundamental differences how humans experience time as compared to other spatial dimensions make segmentation of data cheaper and easier, which in turn allows for greater information density in serially encoded data as proved by einstein in his theory of general clock skew 🤣

i still remember my horror as a very young person when my cs teacher explained to me that i have executable code and data, and the memory has a beginning and an end. memory management is making sure that all code goes in the bottom and that data goes in the top, and then finding appropriate places where you can stop everything swap the whatever intermediate values out to disk to flush the memory

does my memory fail me or is there an ibm lineprinter somewhere missing its paperfeed lol.....

yep x86 implementations ive worked with have all had a similar convention about the always zero bit, it was even in the same place iirc

is a decoder an multiplexer the same thing?

Awesome series of tutorials. Thanks!

Have you ever heard of the Cell2Jack product? It’s what I use to use an old rotary to make phone calls. It connects to my iPhone via bluetooth and can dial using the rotary phone and make outgoing calls as well as receiving calls. It’s definatley helpful when I accidentally left my phone on silent or if I’m in the basement,the rotary phone still rings.

John, thank you so much for your fantastic and unbiased unboxing/review! It’s the best one we’ve ever had! We'd like to upgrade the stand as a small token of our appreciation for your support. Please contact us through our website or the contact on the box. Truly excellent!

I maintain all the S-100 bus computers at a computer miseum. We have about a dozen altairs and about 18 IMSAIs with a boatload of S-100 cards. Jave tons of VT-100s, decwriters, ASR-33 teletypes. I work will all versions of CP/M even MP/M. Back in the day i wrotr ALL my code in assembler on an IBM Mainframe since 1969. When i built my IMSAI (hated altair becuase front panel was octal - so unatural) i wrote a maimframe emulator so i could test my mainframe code. This saved me much valuable maimframe test time. I even had a kennedy 9 track tape drive connected to it as well!

hello, in my final exam lecturer asked me that from lw x1 1(x2) where x=1 x=2, what is value of a3 and wd3 also srca and srcb. there was no additional info and i think its impossible to find them without it. and he said you should write but how?

thank you

I got a microscope like that about 12 years ago. It looks mechanically identical, and the images seem to be of similar quality. I use Cheese too! I think it's 640x480, but it's been great for me for inspecting surface mount solder joints. The papers for yours claim 640x480 and 1600x1200 resolution, but I bet you have to command it into higher-resolution. Some of your first images of the QFN chip show how hard it is to inspect those. One thing I did was put a sheet of clear plastic contact paper on the base plate, so that my boards don't short out if I inspect one while it's powered up.

Thanks John. Regarding recording, I noticed an "OBS" folder on your drive, so I'm assuming you use OBS for recording? I'm kinda scratching my head on the scripts discusssion. Does OBS not recognize this directly as a camera? Although I haven't had my morning coffee yet, so maybe I'm missing something obvious 😁

Thank you sir!

Latest Raspberry PI imager is available for Windows. The newer versions have a gear option button ypu can click on to cofigure wifi settings ssh etc. The newer Linux version does as well makes this task much easier then it was when you originally described this setup. I love this Z80 project! Thanks

Howdy John ! been keeping an eye on you but its all to mathy complicated stuff Lol! This however was interesting as I have been following James and his games machine for a while and lots of people specially the new ones ask about this camera, so I figured I would see what you thought of it, and like everyone else your super stoked so that's great ! nice review and James is super nice bloke......cheers

it work! thank you

Webcam is a webcam. It SHOULD be plug-n-play. I'm suspicious of Windows and Mac needing anything on CD.

Nice, thanks. For a practical use, I use one to help align solder stencils to the PCB. It helps to get a view from right overtop of the stencil aperture while adjusting the knobs and locking the position.

Thanks 👍

9:52 + x86 and x64 too - according to Intel, abominable AT&T syntax must be wiped off from the Earth

Thank you for the great videos about Boolean Algebra - the link to the BooleanAlgebra.pdf is dead (yes, I know it's an old video :-)). Is it possible to download BooleanAlgebra.pdf from another link?

Thanks - had two phones that the kids have been playing with and wondered how easy it would be to get them to be able to talk to each other - looks pretty straight forward, shame the ringer would be too excessive to setup for them, they'll just have to keep shouting riiiiing riiiiiiinnnnnng like they do at the moment - thanks for the video

Thanks for your explanation. It is very clear and helpful.

"On odd numbered Thursdays, if you wave a fish over your head.." is hilarious...

My youngest kid (about 10) was allowed to run "moon landing" on my IMSAI when I was at work . One of the power-caps burst into flames and my poor kid thought he broke my machine. We repaired it as a team. He caught on to electronics pretty fast.

I had an IMSAI. Had a green monitor, used, a math-card, etc (all soldered by me) and I think largest memory I could get. I bought a used teletype with tape reader. I added two floppy drives. I rigged up an acoustic modem and each evening I down loaded commodity prices from a service (35 dollars a month). I wrote a program, in basic, that back traded 81 days for 14 commodities. The programs were "chained". that is, loaded run and exits,then reloaded a new set of commodities. Then the program spit out "buy, sell or hold" from the optimum trading parameters. Most "hold" BTW. The program was run each trading day after market close. The whole run time was 4 or 5 hours. In the morning, at 5AM I called in my trades for the day. I made a lot of money with that IMSAI.

Octal is so un natural. Electronics back then was grouped by 4, not 3. I am well aware that DEC used octal as well as some other minis, still doesnt change the facts. IBM mainframes used Hexadecimal rotary knobs. At a museum I volunteer at we have MANY Altair & Imsai machines