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HardMPU HardMPU, anyone?

PS/2 to RS-232 Serial mouse protocol converter by sklawz with PIC16F628a microcontroller: PS/2 to Serial Mouse protocol converter
site: https://wiki.kewl.org/dokuwiki/projects:pcpointer

Alexandru Groza's website: The gerber files aren't currently shared but schematics are there and the write-ups on his experiences with each project are a great read:

• 16-bit ISA backplate - AT format: http://www.alexandrugroza.ro/microelectronics … lane/index.html
• 4MB 30-pin SIMM: http://www.alexandrugroza.ro/microelectronics … simm/index.html
• 386DX ISA Single Board Computer: http://www.alexandrugroza.ro/microelectronics … sbmc/index.html
• ISA I/O Card: http://www.alexandrugroza.ro/microelectronics … face/index.html

PC Chips M919 Cache Module Clone: PC CHIPS M919 Cache Module Clones
site: https://easyeda.com/jerryt74332/m919-cache-completed_copy

HardMPU is an excellent example, I was able to build my own working HardMPU boards from ab0tj's schematic.

Throwback Operator - OPL3 hardware VGM player (sort-of PC hardware): https://github.com/AidanHockey5/Throwback_Operator

WavePi - Raspberry Pi MIDI synth: WavePi: Use Raspberry pi (2/3/4) as a AIO MIDI synth
There's a schematic and working code, there are examples of it working. It seems to have gone a bit quiet though.
site: https://github.com/t9999clint/WavePi

I wasn't aware that my projects present such interest.
I updated the web pages and included the Gerber files for the designs that I tested and deemed as working.

PS: You might want to modify the links as I moved some pages. Also I think the audio interface card is missing from the list above.

Thanks,

ALEKS wrote on 2021-03-16, 07:28:

I wasn't aware that my projects present such interest. I updated the web pages and included the Gerber files for the designs tha […]
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I wasn't aware that my projects present such interest.
I updated the web pages and included the Gerber files for the designs that I tested and deemed as working.

PS: You might want to modify the links as I moved some pages. Also I think the audio interface card is missing from the list above.

Thanks,

Looking through the pages on your website... it seems you also have some incorrect links from moving the pages around 😀

Very interesting works you're doing there !

Also, from reading your ISA I/O interface page. Was the problem of it not working on a pentium cpu with cache enabled solely due to a bad chip or chip incompatibility, kinda confused on that.

Thanks for the broken links hint. I corrected them already.

Regarding why the floppy disk drive controller does not work whith my test system with a P233MMX CPU, I don't know the root cause, yet.
Debugging this kind of issues is very time consuming. I do have access to the test equippment required for observing the timing diagrams at a hardware level but I don't see myself doing that in the close future since I have lots of other priorities already. I am keeping this kind of investigation project for one of those cold winter days...

Good thing is that the floppy controller works with slower CPUs (286/386). I haven't tested with 486 since I don't have one around.
Also good to know is that all the other functions of the I/O interface work as expected. I am using 4 CF cards (primary: 2 Gb / 512 Mb; secondary: 4 Gb / 256 Mb) with Windows 98 with this controller and I can get sustained write rates of 1.2 MB/sec. Onboard ROM BIOS is disabled and Windows takes over with its own software INT 13h implementation for the secondary controller. I'd say this controller exceeded my initial expectations.

Cheers,

Here's a few small projects I made:

Ninjamicro FreeSpeed AMD Goldfinger Clone:
Re: Making an AMD "goldfinger" clone ?

2-digit Turbo MHz Display:
Re: Fabricating a New Turbo Display

EGA Feature Connector 120-column and 132-column Adapters:
[Super EGA-120] PC Magazine Volume 5 Number 15 Project

Asus P2B-DS Rev 1.06 FSB Modification Adapter:
Asus P2B-DS Rev 1.06 FSB Modification

Not a PCB project, but rather how to easily convert a Pentium Pro Shuttle HOT-613 Single CPU to Dual CPU:
WORKING Shuttle HOT-613 (Single to Dual - Pentium Pro)

AWE64 SIMMconn files I converted from the original, with BOM/JEDECs:
Re: Simmconn AWE64 Adapter

Let's add a link to this thread just for completeness:
The comprehensive list of all modern reproductions of vintage sound cards

Need to make this thread a sticky.

MT32-Pi MIDI Hat: https://github.com/chris-jh/mt32-pi-midi-hat
UpLateGeek's 30-pin 4MB SIMMs: https://github.com/UpLateGeek/Let-s-Make-Some-Memories

Amiga/C64/8-bit Stuff:
Hoglet's RGB2HDMI: https://github.com/hoglet67/RGBtoHDMI
Bloodmosher's Amiga 2000 RGB2HDMI: https://github.com/Bloodmosher/Amiga-VideoSlot-RGBtoHDMI
Claude's Pi-Storm Amiga Accelerator: https://github.com/captain-amygdala/pistorm (latest Altium source, gerbers & BOM is in the Discord, or group buy there for about $12)
LIV2's 2MB Chip RAM for Amiga 500/2000: https://github.com/LIV2/A500-2Meg-Chip-ram
LIV2's 8MB Fast RAM for Amiga 500/2000: https://github.com/LIV2/GottaGoFastRAM
Floppie209's Amiga 2000 PCB Remake: https://github.com/Floppie209/Amiga2000-remake
Chucky's ReAmiga 1200 PCB: http://www.reamiga.info/?page_id=38
Chucky's ReAmiga 3000 PCB: http://www.reamiga.info/?page_id=40
Chucky's Amiga 4000 Replica PCB: https://github.com/ChuckyGang/A4000RevB

My SIMMs are not open-source, or at least I have not knowingly made any resources publicly available 🤣

I do think it is a good idea to make this thread a sticky ~

Ah, I didn't know. I just saw the Github repo in your thread and thought it was yours.

wiretap wrote on 2021-03-21, 12:33:

Need to make this thread a sticky.

Tiido wrote on 2021-03-21, 12:55:

I do think it is a good idea to make this thread a sticky ~

Okay, done - just remember that VOGONS (including Marvin) is so full of quality threads that it would be very easy to fill Marvin -> General Old Hardware's first page with stickies - and then some 😉

Yeh, that's why is a good idea to have an index of gold projects as sticky, like the present one.

Interesting, I was asking mods for such thread last year because there are various interesting community HW projects but they are shattered over the forum and outside on author's webises and nobody replied me. So I put my personal list of interesting projects I have found (mostly for me and friends)
http://rayer.g6.cz/hardware/retrohw.htm

It would be good if adalbert can collect this thread links and will keep them updated in top post as it will grow to multiple pages...

RayeR wrote on 2021-04-03, 16:50:

It would be good if adalbert can collect this thread links and will keep them updated in top post as it will grow to multiple pages...

I collected all of the links in the first post, I will try to improve the list a bit later (maybe make some categories, etc). I also included a link to your website: http://rayer.g6.cz/hardware/retrohw.htm, though not all of the projects seem to be open-source. I would like to mostly include projects that allow everyone to contribute, make improvements and modifications etc. But maybe another category for "non-open" community projects would also be OK.

https://twitter.com/Toble_Miner/status/1341029666254180352

Isn't retro per se... But this may interest people who would want a bit more reliable and faster storage than using standard SDcards. I've also read these are more resistant to write wearing, but don't know... eMMC on board driven nettops seem to die fast because storage kicking.

hyoenmadan wrote on 2021-04-05, 22:26:

https://twitter.com/Toble_Miner/status/1341029666254180352

Isn't retro per se... But this may interest people who would want a bit more reliable and faster storage than using standard SDcards. I've also read these are more resistant to write wearing, but don't know... eMMC on board driven nettops seem to die fast because storage kicking.

I don't see a source anywhere for that. Is it a closed project or can the gerber files be downloaded somewhere?

eMMCs are mostly used as internal storage of mobile phones. Similar to SD cards theirs quality depens widely on manufacturer but generally should be better...

awesome stuff , i would like to see a yamaha db50xg wavetable clone