First post, by asaggynoodle
Good day all!
I am posting here to get some help from this wonderful community that can hopefully help me to identify this ever increasingly strange IBM machine I've acquired recently.
So, from the outside the machine is Labled as a U.S. Logic DX4/100 machine, with a badge on the back that says "Made by IBM Corporation." So I'm going to draw the logical conclusion that the machine is sold as an OEM to U.S. Logic, whom from what i've scrounged up is a basically defunct IBM system seller, from 1995. I'm willing to doubt they have not made any computers in over a few decades, so no leads there. Upon closer inspection things take a turn for the strange when I'm greeted with an Empty 486 Socket... Meanwhile the machine still POST's with an "IBM DLC3 100Mhz" ??BLue Lightning?? CPU. Sure enough, right next to the IIT Co-processor is a Surface mount IBM 486DL3 w/ Fan and Heatsink. Nothing like having a dual 486 Motherboard? Strange enough, there is not a single Serial number, or Manufacturer mark (even from IBM) anywhere on the board.
The Varta 60MaH 3.0v CMOS battery had leaked, so I took the board out along with my newly discovered UMC UM85C4X8 SVGA card and pulled the battery along with the traces.. So after spending 20 minutes reflowing some jumpers and fixing the traces we're back in buisness... Upon search reveals a total of 5 archived results from a forum in 1995 about this same card, none of which provide any beneficial information.
Sure enough this board even has a pair of IDE Controllers on board...
I purchased an PS/2 to AT (5 Pin DIN) connector, to my amazement the keyboard still fails to work.. So I cannot get any device manager or serial numbers off the install (Which i'm 100% is still in there).
I have an Album of photos, here:
http://imgur.com/a/HDeQy
And some of the Case:
http://imgur.com/a/AQkxX
If anyone can please point out what kind of system I have here I would greatly appreciate that.. Or at least help me with figuring out how to get the Keyboard working unless I have to go out and find an inexpensive AT one.
Thank you 😀
--Sam
**EDIT, So i just went to the lengths of removing the motherboard and all of the ISA cards... I used my Reflow Station and pulled the DIN connector. Looks like the Battery Disolved all of the Copper plating around the Thru Hole rings, I tried my best to replate them and re-run the traces.. I believe I had done everything correctly and reflowed the DIN connector.. Put it all together and prayed.. Nope.. Same problem :L
So my question now, Is can I use one of those serial Keyboards or the ones that plug in via RJ11? I have a modem card with two jacks, and some other cards that appear to have serial connections..
Also, I've taken a picture of the motherboard itself for those who are still curious as to what it looks like. I cannot get a Money shot of the DLC3 because the Heatsink is actually Adhesived to the QFP of the CPU. So i'm going to not mess with it.. Since reflowing all those pads on accident would be a Bite in the sack.
Here is the money shot of the Motherboard:
http://i.imgur.com/Ak4ydlu.jpg