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Article #625475Re: different architecture, was PDP 11/40 system manual
From: Peter Flass
Date: Wed, 15 Aug 2018 21:42
Date: Wed, 15 Aug 2018 21:42
45 lines
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3714 bytes
Dan Espen <dan1...@gmail.com> wrote: > 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. > Most of my early career was developing software for customers with 32K 360/30s, and that seemed to work out quite well. Obviously basic batch applications: personnel, payroll, accounts receivable/payable, inventory, etc. -- Pete
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