Okay, that didn't work. I think P3 disables the controller on the card. So test results are like this: Onboard controller off, ISA on, disk on ISA controller: boots up without errors. disk gives Track 0 unreadable /invalid media errors on format or dir using either the Gotek USB drive or the 3.5 …

I should note that the ISA controller is an IBM 6181682. I'm still looking to find documentation on it, the only jumper is a single one marked P3 , and I'm not sure what it does, but I guess I'll try it closed (as I found it) or open and see (unless someone has other ideas).

thanks! I did try similar things and also a new AT supply over the last week, and the same results. I've decided to make lemonade out of lemons and I'm using the 350 case to build a SBC and backplane PC; I got a 5 slot backplane , apparently made for a Nortel server by IBM (it has the florida-with- …

Hi - I have an Epson Equity 1+ that I recently received - amazingly, its old hard drive still works, and boots to DOS (epson's variation). However, I cannot get ANY floppy drive to work on it. I've tried the original 5 1/4 inch disk drive, several 3 1/2 inch disk drives, including an Epson one from …

Given the lack of response I guess I was pretty thorough in my troubleshooting (yeah, we'll go with that! :D ) . I'm wondering if bad caps could be the culprit? I have to take my ESR meter to each but at a glance none of the aluminum electrolytics look bad - no bulges, malformations, leaks, or …

Hi. I have an IBM 350 P100, and when I got it, it was working though there were some pecularities with the IDE channels. I had to put a new coin battery in for the CMOS. The machine is now in a state where I don't even get beeps anymore, even with the board out, on a non-conductive surface, with and …

First of all, sorry it took a few days to get back to you all. Life has been busy. Your answers were very helpful in getting me to understand this, and also I find the esoteric history of these developments interesting. So I got more than I thought I would and that's awesome, and I greatly …

Hi all! New here. Been decades since I last worked on building my own PC's and working on these old processors, so some of my knowledge has disappeared into the mists of time, so apologize if this is a dumb question as I get back into 'vintage computing'. I'm working on an old IBM Aptiva. I'm used …