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Article #625485Re: 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
39 lines
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3364 bytes
John Levine <jo...@taugh.com> wrote: > In article <504928995.556023147.9526...@news.eternal-september.org>, > Peter Flass <peter...@yahoo.com> wrote: >>> More to the point, the /44 only implemented a subset of the 360's >>> instruction set, so even with different peripherals it couldn't run >>> any other OS. >> >> I understand there was a later microcode update so it could run OS/360. > > So the IBM web site says, but I doubt it was very popular. Why get a > machine with strange realtime peripherals if you want to run OS? > >>> 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've read the manuals too. The card version of BOS was called BPS, > and none of BOS, DOS, or TOS, could do multiprogramming until much > later versions of DOS. It looks to me like the disk management was > even more primitive than DOS, with sets of disk tracks explicitly > assigned to files, That's how DOS worked, although I think the've improved it since. SYSPROGs used to have all charts showing disk map of each pack. > and it didn't work with more than 32K which > suggests they used direct addressing and 16 bit adcons. > > -- Pete
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