Not PC, but 68k and PowerPC Mac related, though I figure it still fits the thread:

68kMLA user Demik released a PCB design for a 65% keyboard using the ADB controller IC of the AppleDesign rubberdome mushboards, dubbed Design68 (GitHub repo here).

If you have a bad condition AppleDesign board, or maybe one with damage to the membrane, this is an excellent way of reusing its controller IC for something far better.
The PCB is designed to fit the Tester68 keyboard kit, which is a very cheap ($20-ish) keyboard kit from China.

Add suitable switches and keycaps to taste, and it's a lovely new mechanical ADB keyboard.
Just ISO for now, but maybe ANSI layout is possible at a later time.

Daniël Oosterhuis wrote on 2023-09-12, 06:42:

Not PC, but 68k and PowerPC Mac related, though I figure it still fits the thread: […]
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Not PC, but 68k and PowerPC Mac related, though I figure it still fits the thread:

68kMLA user Demik released a PCB design for a 65% keyboard using the ADB controller IC of the AppleDesign rubberdome mushboards, dubbed Design68 (GitHub repo here).

If you have a bad condition AppleDesign board, or maybe one with damage to the membrane, this is an excellent way of reusing its controller IC for something far better.
The PCB is designed to fit the Tester68 keyboard kit, which is a very cheap ($20-ish) keyboard kit from China.

Add suitable switches and keycaps to taste, and it's a lovely new mechanical ADB keyboard.
Just ISO for now, but maybe ANSI layout is possible at a later time.

I've seen something like that keyboard in an LGR video

A project you might wanna add to the list: USB HID Devices on PS/2 and Gameport.

Bluetooth to PS/2 dongle based on ESP32 https://github.com/Hamberthm/esp32-bt2ps2

S3 Vision 968 VLB replica by Madao
S3 Vision 968 VLB replica
https://github.com/matt1187/968VL

I forgot about my own :0
Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction by rasz_pl
FIC 486-GAC-2 proprietary cache module - open source reproduction *Completed*
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module

>S3 Vision 968 VLB replica
Nice, I have seen this video chip only on PCI cards yet. Does it mean that S3 made this chip to operate in both environments and there are some strap pins to select one or could potentialy any PCI chip work on VLB (with some ext. hacks or out of the box)?

Commodore-PC10-III PCB Reproduction https://github.com/Board-Folk/Commodore-PC10- … II-Reproduction

https://github.com/microsoft/MS-DOS/

msdos 4.0
perhaps in due time maybe it will help with software compatibility with old games in dosbox

As far as I have checked, the following has not been added to this list:

It's a XT rebuild with isa-backplane and ISA-addon cards

https://www.homebrew8088.com/
https://github.com/homebrew8088/8088-PC-Compatible

A 16bit-version is also available:
https://github.com/homebrew8088/8086-PC-Compatible

A Youtube-Channel is also available (that's how I found it):
https://www.youtube.com/@elijahmmiller

What I find most curios: cpu and memory were put on separate ISA-cards, also for the fact that it makes routing much easier. Mainboard and cards are all 2-layer PCBs only

For completeness

ITX-Llama, a motherboard to host Vortex86EX SOMs
ITX-Llama (Vortex86EX ITX motherboard) - DONE!
https://github.com/eivindbohler/itxllama
https://retrodreams.ca/products/itx-llama-mainboard
https://shop.dmp.com.tw/INT/products/153
https://shop.dmp.com.tw/INT/products/25

It's not a PC but somewhat inspired by nostalgia from the 386/486 era using old (and new) ISA expansion cards.
Motorola 68060 @100mhz on Micro-ATX, acting as a "high-end" Atari clone.
https://github.com/agranlund/raven

Testing GUS and Soundblaster:
https://www.youtube.com/watch?v=1NH3bofAOsI

Testing PicoGUS:
https://www.youtube.com/watch?v=46D3q_mD794

Nice project, a good place where to drop a spare 68060. But more problem would be getting other atari specific chips.
I plan to start with something simpler from 68k world, this nano dev.board. I have the large CPU and it doesn't require any other unusual chips, I'll order some PCBs from JLC...
https://github.com/74hc595/68k-nano

RayeR wrote on 2024-11-11, 22:32:

Nice project, a good place where to drop a spare 68060. But more problem would be getting other atari specific chips.
I plan to start with something simpler from 68k world, this nano dev.board. I have the large CPU and it doesn't require any other unusual chips, I'll order some PCBs from JLC...
https://github.com/74hc595/68k-nano

That looks like a nice board!

Raven doesn't actually use any of the Atari-specific chips (not that there were many).
But you're correct in that these standard Motorola-family chips and the YM are long out of production; MC68060, MC68150, MC68901, YM2149
It runs "clean" Atari applications natively, but old Atari-ST games run encapsulated and by help from software emulation. The 060 is more than powerful for that.

Major Jackyl has run up a quick 3D printable motherboard standoff, in case you run out Re: I never thought the hardest bit about building a 486 would be...

'Project to create an ATX 80286 mainboard based on the IBM 5170' https://forum.vcfed.org/index.php?threads/pro … m-5170.1243108/
https://github.com/rodneyknaap/atx-286at-v1-mainboard
>Project status (july 2024): The mainboard and ISA memory card are built and extensively tested.

...and he's working on 486 ATX 😀
https://github.com/rodneyknaap/atx-486at-mainboard

Here's the first step towards a ppro>tualatin 440bx board.

I doubt I'll be able to do the rest, but someone might

The thing no one asked for: KICAD 440bx reference schematic

I have a bunch of vintage computer open source projects:

https://microcorelabs.wordpress.com

https://github.com/MicroCoreLabs/Projects