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Article #625474Re: different architecture, was PDP 11/40 system manual
From: Dan Espen
Date: Wed, 15 Aug 2018 20:42
Date: Wed, 15 Aug 2018 20:42
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3330 bytes
hanc...@bbs.cpcn.com writes: > On Wednesday, August 15, 2018 at 7:09:42 AM UTC-4, Peter Flass wrote: > >> >> All the rest other than OS were mistakes. IBM was unable to get >> >> even PCP to fit on the smallest machines, so DOS, TOS, BOS were written as >> >> "temporary" systems which became permanent. >> > >> > Yes. I never entirely understood the difference between BOS and DOS. >> > I realize that BOS could run in 8K and DOS needed 16K, but what else >> > did BOS leave out? >> > >> >> I don't know that much about BOS either. I used to think it was a subset of >> OS, but Bitsavers has some manuals and it appears it was a subset of DOS. >> I'll have to read the manuals. I would assume it at least left out >> multiprogramming. I think BOS could be run from cards. > > I think the IBM S/360 history says BOS was intended as an > emergency operating system rushed out so the users would have > something to use quickly. It could also be used in very small > systems--I believe S/360 was originally offered in only 8k (later > raised to 16k). DOS was also an emergency development, but > DOS managed to be permanent. An 8K S/360 would have been useless, OTOH, lots of 8K 1401s worked very well. IBM managed to design something so complex that it needed an OS, and IBM couldn't shoehorn the OS into 8K, let alone any applications. An existing 8K 1401 shop would need a S330/30 with 64K. Lots of places tried 32K, that never worked well. -- Dan Espen
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