🚀 go-pugleaf

In article <7HU77.9333$TM5.9...@typhoon.southeast.rr.com>, 
d.h...@computer.org (Daniel House) wrote:

> Having recently discovered a salvage case, I'm interested in this 
> system.
> Is there any online information about it? Google/image searches came up 
> very
> light.  I located Vol.6, No.2 of the IBM Systems Journal (from 1967)
> describing the system and programs for it, but I'd like more, including
> pictures if there are any to be found. There are only a few drawings in 
> the
> SJ.
> 
> Thanks, Dan House
> 
> 
> 
I recollect reading that the 9020 was, or at least started as a 
multiprocessor version of the S/360 Model 40. No doubt there were changes 
and additions to the instruction set. This would have been very easy, as 
the Model 40, and most of the 360 line at that time, had microprogram 
control. In the case of the model 40 (and 30, following the abandonment of 
another technology), the microprogram was stored in a transformer 
read-only memory whose physical design (at least) allowed easy changes.

It would be interesting to learn what changes other than the mechanics of 
shared memory were made.

Mike Kingston