🚀 go-pugleaf

Dan Espen <dan1...@gmail.com> wrote:
> John Levine <jo...@taugh.com> writes:
> 
>> 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, and it didn't work with more than 32K which
>> suggests they used direct addressing and 16 bit adcons.
> 
> I implemented a multiprogrammed online system on a very early
> version of DOS, long before DOS/VS.  I think ATTACH and friends
> were pretty much there from the beginning.

DOS used to have a max of three partitions: BG, F1, and F2, with no
multitasking within a partition, so no ATTACH. 

> 
> Never saw BOS put to serious use, I think BOS gave you about a 4K
> supervisor where DOS would be 10K or so.
> 

6K or 8K. I remember working through the "storage estimates" manual to
figure out what I could include and what had to be left out. "Let's see,
this feature requires 32 bytes, can I specify this?"I think 6K was BG only.


-- 
Pete