First post, by stopi
I try to run HLH386SX motherboard. Brand Nic Technology https://stason.org/TULARC/pc/motherboards/N/N … 6-HLH386SX.html. I have:
- 386SX-25 motherboard on Headland HT18/B chipset
- Cirrus Logic CL-GD5401-42AC card
- ATX power supply with self-made connector for AT slot
- standard VGA LCD monitor with D-SUB cable
- POST codes card
- 2 SIMM-30 modules (3-chip 1MB each)
- BTC keyboard
Power is starting after green-black connection in ATX cables. POST card shows "FF.."
I checked voltages. There is +12, +5, -12, -5, PWR_GOOD is about 5V. +5V is present on most important circuits on motherboard and ISA cards.
3 diodes on the keyboard are lighting. Nothing happens. I tried to place VGA card to other ISA slot. No result. I tried to run with only 1 memory module. I doesn't start. Keyboard BIOS is warm (but maybe it's normal..). Maybe memory is problem - there should be 9-chip modules but I placed 3-chip simms. I don't have speaker actually and I can't hear if something is buzzing....
I remember that motherboard was working.
I have oscilloscope and programmer. Maybe I should to check BIOS? What about crystal oscillators after 25 years without usage?