What can you see in device manager?

Horun wrote on 2023-08-13, 15:28: Thanks I did miss those two jumpers for FDD/HDD enable. The scsi chip TMC950 was used on TMC850 series controllers and if you choose low IRQ (2,3 or 5) can be used in a 8bit XT slot. Is there any marking on the back of the card ? Only chinese stamp and serial …

+5V pins B3 and B29. They are on the other side of the card. B1 is located closest to the bracket. First element on +5V rail is usually electrolytic capacitor (C10 on your board). It should be placed between +5V (B3) and GND (B1). So you can start searching there. And be aware what are you doing. …

Hello What did you use for mounting heatsinks on MOSFETs?

Unfortunately the nature of failures in case of that kind of PSU is usually catastrophic. This fuse is meant to prevent fire not to protect the circuit. You should start checking from the low voltage side (transistors, caps and diodes for shorts, resistors and coils for break) and continue to high …

Same type as on the board or equal 256k x 4 20 pin DIP dynamic ram at 80nS or faster (yes board has 70's but 80's might work OK. EDIT: no you probably need 70nS or faster, missed the cpu is a 20Mhz). You want 8 of them. Best not to buy from China....approx cost about $40. It currently must be …

The scsi part is same as FD TMC-850. Doubt the dual floppy part will work unless the motherboard bios supports 4 floppies or you use a driver. No enable/disable for floppy, IDE or scsi so is def an OEM specific adapter. Yeah SCSI part is common for many FD cards. Frankly using 4 floppy disks with …

Hello again 😀 Another interesting piece of hardware here. Basically SCSI internal/external controller + 1 IDE connector (so 2 drives) + 2 FDD connectors (so 4 drives) and of course BIOS included. I've searching for the model but with no luck. Picture bellow: Filename IMG20230812223749.jpg File size …

Ok, so maybe someone could tell me what kind of RAM chips should I use here?

Hello again :) Did you check for clues on TheRetroWeb, particularly Advanced Computer Technology & LTI boards (may be some PCPartner / VTech dna going on here?) https://theretroweb.com/motherboards/?manufacturerId=242&showImages=1 https://theretroweb.com/motherboards/?manufacturerId=17&showImages=1 …

Hello Everyone. I'm about do fix an interesting (at lest for me ;) ) 286 motherboard. Unfortunately I can't find any details about it. Chipset - ACT 27C000 CPU CS80C286-20 Marks on PCB: 35-7009-02-00 Advanced Computer Rech 9038 A/W:710009B Is there anyone who can recognize that MB? Picture bellow. …