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Unfortunately with the keyboard disconnected it still gives a 303 error. I did find my stock of Dallas RTC modules (I use the ones designed by Necroware) which use the Dallas DS12885S chip (or Bencmarq equivalent) However the errors persist whether the original Dallas module or the replacement...

Hello all, I recently picked up an IBM PS/2 Model 30 286. Despite being filthy the machine looks to be in relatively good shape. So far I've successfully booted to the 30MB hard drive once. However, I now continue to get the following error codes in POST: 303, 163, and 164. Codes 163 & 164 are...

Thank you Chuck(G). I appreciate the help.

Hello again all, I currently have some Magnetic Peripheral Inc (MPI) 360k DSDD full height 5.25" floppy drives on the bench and they are in need of some help. Two are missing their drive latches (3D printing to the rescue), but I've noticed that of the three drives only one of them has a...

Hello all, I have recently acquired an IBM PS/2 Model P70. While removing the faulty floppy drive for service I broke the small plastic clip which holds the drive vertical and clicks into place. I attempted to glue the small piece back together, but I've been unsuccessful in repairing it. I was...

Oh Cool! I didn't even know this was a thing.

Greetings, I've recently acquired an IBM PS/2 Model 30 with a dead ESDI hard drive. As these drives are getting harder and more expensive to find, I was wondering what folks thoughts are on trying to keep the system original, or if I should grab an XT-IDE CF adapter and call it a day. Thankfully...

Thank you! Very much appreciated.

Thanks for the reply. I'm still learning, so I'm not sure how to go about measuring the signal.

Hello all, I recently rescued a rusting 286. I've been steadily going through testing and repairing components as necessary. I've already swapped the VGA port on the graphics card (which I can find very little about) as it was rather rusty and untrustworthy. The rest of the card looks great...

Here is the Rev B board on RetroWeb https://theretroweb.com/motherboards/s/edom-wintech-ma022-rev-b

Hello all, I'm currently working on a Edom/Wintech MA022 Rev. A motherboard. It has an AMD 386DX-40, Cyrix FasMath 387, 8MB of RAM (30 pin SIMM), Trident VGA card, etc. My current issue is that any time I install a sound card with an IDE controller on it (which is the goal) it causes the hard...

Thanks everyone. I've soldered on a two legged tantalum. Very much appreciate the clarification.

Morning everyone, Recently I came across this card in one of my IBMs. I don't recall which one. In any case I noticed one of the tantalums had blown, and after a little searching found the missing half. The attached photo shows it "together". It's a three legged center positive (I believe)...

I just tested it with my meter and it's reading about 4.5v on pin 2.

Hello all, I just finished recapping a failed power supply for my IBM PS/2 Model 76. I bought it off an older fellow who was downsizing and he sold it to me cheap as it didn't power on. He and I figured it was bad caps (and it certainly was). I finally go to power the system on, and I am met...

Hello all, I got a 486 motherboard in the mail today, and upon close visual inspection I found a damaged ceramic cap. I'm not familiar with ceramic caps, and so I'm not sure the value I need to replace this. On one side is the number 22 underlined, which if google is to be believed should mean...

As always you are a wealth of knowledge. Thank you.

Well I decided to try the cap anyway and much to my delight it fit without needing any modification. It seems 7mm is the smallest inter-pin spacing this board can fit.

Morning all, I'm currently working on reviving an IBM XT motherboard (64-256kb board) and I noticed that I have a few ceramic capacitors missing (C9 and C66). From what I've found it they are labeled K5M 470 & K5M 473 (as it seems most of the ceramics on the board are). If I'm reading the...