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Hi all! I'm happy to learn about your interest in my work! Thank you Markus for letting me know about the revival of the thread, I'm sorry I didn't see it sooner. The IBM5170 SRAM replacement board was a very nice project, and although many details are dim to me now, I'd be glad to help...

Hi everyone! If in a hurry, my questions are at the end. So I bought an old 5170 a few years back at auction, with more or less unknown condition. I recently started working on the machine, which at first was dead, and quite badly corroded. The PSU was dead, but I located a failed LM324...

Hi everyone, So I bought a known non-working 5150 last week. As I drove home I really looked forward to some quality time trouble shooting, and man did I get just that! :) Started off with the usual visual inspection, and apart from an after market Six Pack Plus equipped with 256kB the machine...

Thank you for suggestions! I'll test the xt-ide in a working 5160, but since I have three if the all giving this problem I do believe it's the computer. Could anyone comment on this capture of logic levels during read operation? Strobes on IOW_ISA should be DRAM refreshing (66kHz), the duplets...

Hello and thank you all for contributing to this wonderful forum. Situation: I get Parity Check 2 error message almost every time i press the enter key, but only when system is equipped with a XT-IDEv4 and HDD. Background: I recently purchased an IBM 5155, equipped with a NIC and a 384kB RAM...

Hi! I have an IBM 5160 with the 64-256k motherboard and the 11/08/82 BIOS. Original BIOS ROMs are labeled U18=1501512, U19=6359116. I wish to upgrade BIOS to the 05/09/86 version, but I don't own a programmer so I asked for help in a facebook group and a kind person helped me out. So I got...

Hi! I have a 20MB Seagate ST-225 MFM HDD acting a bit strange, and I'd like to hear your thoughts on this. The drive is connected to a small Western Digital controller card in a IBM 5160. I believe it's an after-market option, and also, the black cover in front of the drive is 5,25" half...

Hi! Yes, you are both most likely right that it can't be an official BIOS release since it isn't mentioned anywhere, but the person I bought the computer from claimed it to be made my IBM France nonetheless. Perhaps some beta version never released, is my best guess. As you both suspected the...

Yes, you read correctly, 1989. I recently purchased an IBM 5162 on Ebay, which not only came with 2 working Seagate ST-225s and a CPU running at 8 MHz, it also has a motherboard ROM reporting BIOS date 1989-04-28. I was told that it is a genuine IBM ROM by IBM France, and I did test that both...