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Last version of DOS to support Jr?

PostPosted: Sun Dec 18, 2016 9:03 am
by OldComputerGuy
So what is the last version of DOS to run on a Jr? I had heard it was 4.01, but not entirely sure about that.

Re: Last version of DOS to support Jr?

PostPosted: Sun Dec 18, 2016 6:42 pm
by Brutman
IBM DOS 3.3 is the last version of DOS officially supported on the PCjr. 4.01 might work, but it had a bad enough reputation where I don't even want to bother with it. DOS 5.02 and DOS 6 can be patched to work on a 256K machine - see previous forum postings for the procedure.

Re: Last version of DOS to support Jr?

PostPosted: Sat Oct 07, 2017 10:46 am
by Percussionista
I was able to run DOS 5 on mine, with 640k no problem, though no real reason to do so ;)

Re: Last version of DOS to support Jr?

PostPosted: Sat Oct 07, 2017 10:49 am
by Brutman
A big reason to run DOS 5 is large partition support ... with DOS 5 you can go over 32MB per partition. That's useful for those of us using hard drives on the Jr.

Re: Last version of DOS to support Jr?

PostPosted: Sat Oct 07, 2017 10:56 am
by Percussionista
Aha! Well, I never got beyond floppies. I forget that many folks turned their Jr's into "real" computers. Pretty cool!