IBM PC-DOS 2.10 explorations

Will Senn will.senn at
Sun Oct 4 13:18:19 CDT 2020

Sent from my iPhone

> On Oct 4, 2020, at 1:07 PM, Fred Cisin via cctalk <cctalk at> wrote:
>> On Sun, 4 Oct 2020, Will Senn wrote:
>> I am using a Thinkpad T430 w/DOS 6.22. If I can figure out how to get 3.31 on there, I'll give it a shot. I bought a Floppy-USB connector for my old 1.44 floppy drive and it works fine with DOS 6.22, but I'm not sure where to locate 3.31 media that I could burn onto a 1.44 floppy and boot. I have sealed IBM DOS 3.3 media, but I don't think my T430 is really compatible :). So, I'm not keen on opening the seal...
> I'm curious.
> 6.22 did not have native USB support - that didn't come about until WIN98SE.
> Are you running CONFIG.SYS drivers for it?

I think it’s the laptop BIOS faking the USB as a standard floppy to DOS.

> If you can find an original copy of COMPAQ MS-DOS 3.31, that was originally available on 1.2M and 1.4M
> Zenith MS-DOS 3.31 is another popular choice.
> Try to find it, rather than opening the PC-DOS 3.30.  3.30 (and all earlier) did not support HDD >32M, although there were ways to cheat that limitation, such as the network redirector (with MSCDEX) coul make a local drive LOOK like it was a network drive elsewhere.

Great to know, thanks!
> --
> Grumpy Ol' Fred             cisin at

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