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I landed another 5150 a little while back and using the knowledge I gained through great advice from forum members in getting the last one going I set this one up pretty much the same. Unlike the last one, this one had a few bad memory chips, but that was the extent of it's issues. This time I...

For me it was not big deal. Upgrading the XUB was indeed the right thing to do as I only had MS-DOS 5 and Turbo BASIC on it. So, I went ahead and re-did the installation of DOS and TB. Now everything is working beautifully! So why do the XTIDE vendors not sell their products with "Full...

I believe I did.

Finally got around to trying this. Everything went well until the re-boot. Now I get a "No operating system" error. This is rapidly converging to "It's just not worth it!" So, now I have to re-install everything? I guess? Or did I brick my XT-IDE?

Well, I am but left the word "tool" out. :-( I was referring to the tool to make the changes. But I guess the best way to figure that out is to try it. On my list..

Thanks modem7. I'll look into that when I get home. Do you think that BIOS is compatible with my XT-CF?

I may not have been complete in my report, sorry. However, booting from the floppy does not help stability (except boot alone). I still cannot run QBASIC or TuboBASIC. They both seem to fail 100% of the time when doing any kind of file access to any device. It also does not help if I boot...

Okay, going back to on-board RAM. There is no reasonable way to disable the parity without removing all the chips in bank 0 and even then I'm not sure if it would work. But I did have some small success. After putting it back to 640K and booting from the XT-CF I created a system floppy and...

It seems my BIOS looks a little different than any of those on your website. My configuration is a mentioned in the OP without the MicroRAM card. I guess I could try to create a DOS 5 boot floppy and removed the XT-CF card too. My switches are set: SW1: 3-off, 4-off SW2: 1-on, 2-off, 3-off...

Yeah, I think DOS 6.22 has actually lower memory requirements than DOS 5. Not much, but a bit less. I think DOS 4 was the worst. I'll be interested to hear your results. Okay, I will try the disabling U12. May be a few days before I can get to it if I can't do it tomorrow. I'll keep you...

It's not so much instability. I won't even load MS-DOS 5 with only 256K. It will access the disk for a few reads then just stops and locks up. So, the only way I can get it to run at all is with the MicroRAM. That means both the DOS and the MicroRAM. Looks like we were posting at the same...

Well, the behavior is exactly the same as what I tried before. I do know what bus contention is. So are you saying there are buffer chips from the on-board ram to the system data bus? I'll have to look at the schematic. Is that available on your site? So assuming you are correct, what would...

Oh, and Happy New year!!!

Well, tried taking out all the removeable memory and just using the MicroRAM, but no joy. Is there another RAM card I should get? It seems the MicroRAM may indeed be the problem. Maybe a sticky thread should be started to warn people away from it. I'll contact teh seller, but I'm sure he...

So far I have removed every chip in a socket on the MB and the I/O cards, cleaned the leads and re-inserted them with a little deoxit. No change. The next thing I will try is to remove the RAM in blocks 1, 2 and 3 and use the MicroRAM to supply all the memory from 64K to 640K.

Yes, MS-DOS 5.0. Mine is a Rev 1.2. Does that mean I'm knackered?

Thanks folks! I'll look into your suggestions and get back.

HI All, Season's greetings! I have a an 2nd gen IBM 5150 (came with 256K RAM). In it is the standard floppy controller, a Trident VGA card, a MicroRAM card (for 640K) and a XT-CF Lite V4.1. It boots DOS 5 fine. I will run GWBASIC just fine. It will load EDIT, DOSSHELL and TurboBASIC but if...

I also had one drive that seemed to function correctly but gave errors on read. It turned out to be the 74221 one-shot. It may not be the problem yo have, but it might be a good place to check.

Thanks!