jaqie wrote:Several errors in your post. First, most 16 bit cards will work in 8 bit mode if you set their IRQ below IRQ9.
Well, that's correct, but I'm afraid, totally irrelevant here. An IDE controller just provides the interface used to connect the drive. However, the support for IDE disks is integrated on the BIOS on AT and newer systems. Very few XT systems had "native" support for IDE, and if they had any, it would have to be the earlier type that I called 8bit IDE, or IDE XT. That's why you can't just install a 16bit ISA controller with an IDE disk on a PC-XT and expect it to work. I thought that such an experienced techie like yourself would be familiar with that.
jaqie wrote:There is no such thing as "8 bit IDE" as well, all IDE hard drives work with at the very least the old motherboards up to the PIIX4 controllers in first and second generation pentium (P54C and P55C) systems, if not even newer than that.
You can read here that :
In the early days of IDE, there were two other variants on the IDE/ATA interface, that were not compatible with regular IDE/ATA. One was an 8-bit version intended for use on the ancient 8-bit ISA bus of the first IBM PC/XT machines and clones. Another was a 16-bit version designed for IBM's MCA (MicroChannel) systems. Both of these have been obsolete for a decade or more and are no longer seen in modern systems;
I've worked on PCs using that kind of HD interface, have you? I've also tried to replace such a disk with a CF2IDE adapter (which as you say is like a regular IDE disk),
and had no luck,even when I tried with cards as small as 32MB.
jaqie wrote: Getting a floppy, as I said in my post, is very cheap nowadays, I have some just sitting around. You seem to have missed that, as well.
You seem to have missed that the topic starter said trying a couple of other floppy drives had no success. In fact that makes us assume that it needs a 720kb drive. And by the way, I think there should be some jumpers on the floppy drive that might make it compatible to 720kb operation. But if that doesn't work either, that's where a 16bit floppy controller would be useful.
jaqie wrote: I also talked briefly about the option of getting a second oldpc for almost nothing at resale shops and using parts from it to do this work.
I'm afraid this specific disk won't work on any newer system. There were some other "hybrid" disks that would work on either IDE XT or regular IDE (call it AT if you like). I own one of those, and I have successfully installed on 386 and Pentium PCs. But this one is reported as IDE XT only, and in my opinion, that's the issue here. I see that there were two different models released, 93044A and 93044X for AT or XT. Check here .
jaqie wrote:I have personally worked on these sort of systems when they were new. Have you?
I think you are confusing MFM/RLL with IDE.
Yes, I've been working on PCs since 1990. I admit that I didn't use a hard disk since 1993, but I think I can compensate for that by dealing a lot with several pc-xt and later systems in the past couple of years.