20 Aug
2020
20 Aug
'20
2:36 a.m.
small update ... see below..
On Wed, Aug 19, 2020 at 1:39 PM Paul Winalski <paul.winalski(a)gmail.com>
wrote:
In the IBM System/360 world, the first machine with
Dynamic Address
Translation (DAT, the hardware that implements virtual->physical
address transiation via page tables) was the S/360 model 67.
Called the Data Address Translator (DAT) box. I still have my 'TILT' deck
which is an IPL program that used diagnose instructions to spell TILT in
the lights on the DAT box and ring the console bell, which on a 360 was a
fire alarm.
BTW: the 67 had 8 32 bit TLB entries, built out of ECL flip-flops.
The only
IBM OS to use it was CP/67, the virtual machine forerunner of VM/370.
Careful, TSS used it first actually and shipped before CP/67 - but it had a
number of issues.
CMU would work to fix them and Michigan would start and rewrite, creating
MTS (which was not an IBM product but TSS was and shipped into the early
1980s).
I just did a review of a book that I'll find out when it supposed to hit
the streets by some tech historians in the UK. I reviewed the chapter
where CTSS begets, Multics and TSS, beget UNIX and MTS respectfully.
Basically the name of the chapter is the rise of idea of timesharing.
[No worries, the DEC world is in the book also, but follows a different
thread - this is looking at the fight at IBM and GE between commercial
batch and timesharing].