Lopo wrote on Today, 06:37:

Just sent my first PCB revision to fabrication - a reverse-engineered duplicate of the DataExpert 367C motherboard with UniChip […]
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Just sent my first PCB revision to fabrication - a reverse-engineered duplicate of the DataExpert 367C motherboard with UniChip U4800-VLX chipset.
The challenge: there's no datasheet for the U4800-VLX anywhere. All 160 pins had to be mapped from scratch using PCB scans, photos, multimeter tracing, and cross-referencing with other designs (Groza's OPTi 495XLC SBC, Skiselev's SARC RC2016 386SX board).
This v0.1 is essentially a 1:1 copy to verify the reverse engineering is correct. If it works, future revisions will diverge with improvements (ATX power, VLB slots, expanded cache, etc.)

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Fingers crossed! 🤞

This is simply amazing, I commend you for your hard work and look forward to an ATX version.

Worked on my video card Memory Tester Launcher. Boots from a USB stick. It’s just a simple BAT file but consolidates all the memory testing tools in one place and makes sure logs are easy to access.

AndrettiGTO wrote on Today, 00:15:

Susanin79 wrote on Yesterday, 22:05:

Tried to test an IBM PGA card, no luck so far. IBM diagnostic disk able to see it in a list, but failed with the diagnostic.
Will continue with the close inspection under the microscope and ICs deoxit.

Not many of those around and it's a sweet card to have! Maybe try in in CGA emulation mode (Jp W1 @ 1-2) first to see if it passes.

No, I tried this mode. At the boot PC complain about the video mode (one long, two short beeps). Final picture looks strange, the simple blue picture with some tiny pattern, sometime I can see the noise but then it just reset to this blue screen.