🚀 go-pugleaf

Peter Flass <peter...@yahoo.com> writes:

> 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. 

Not sure when that was but I did online 2260s with attach in F1 in
1969.

>> 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.

Yep.  I think I might have gotten one DOS down to 8K but as time went
on, 10K and 12K became more common.

-- 
Dan Espen