LOGI Compact 286 (Rev. A) — resurrection log

As promised in the “Bought these (retro) hardware today” thread, here’s a dedicated log for bringing a LOGI 286 motherboard back to life. This is one of the boards I recently picked up; it’s in better shape than the XT board, so I’m starting here. I’ll post diagnosis and repair progress in this thread.

Board

• Model: LOGI Compact 286 Rev. A
• Chipset: Texas Instruments TACT82301PB / TACT82302PB / TACT82303PB
• CPU: Intel 80286 @ 10 MHz (PLCC68)
• FPU: Intel 80287-10
• ISA slots: 3× 16-bit, 1× 8-bit
• RAM: 4× 30-pin SIMM
• BIOS: 2× 16 KB 27128A (Award 3.03)

Initial inspection (microscope)
Not many issues overall, but a few could cause shorts or damage if left as-is:

• 8-bit ISA slot: pins A2 and B2 are bridged.
• Battery area: leaky connector; corrosion on the FPU socket and on SN74ALS32N (OR gate).
• JP11: jumper torn off.
• RN12: resistor pack with bent legs touching (short risk).
• C64: tantalum cap with a broken lead → needs replacement.

What’s done so far

• IC/chipset legs checked; solder looks good.
• All bent pins straightened.

Next steps

1. Verify AT PSU connector pinout and do a full short-check on power rails.
2. Clean battery corrosion; socket/IC leg neutralization and rinse.
3. Replace C64 and reinstall JP11.
4. Minimal POST setup and begin jumper map.

I’ll keep this thread updated as the work progresses.