I had thought that the 3890 check sorter used a S/3 CPU because
of right-left movement (which those machines did). As I recall,
with SCI code, one had to think the reverse of what a S/360 did
in a move. Granted, I didn't do very much 3890 programming, but I
did a lot of CPCS programming to handle various tasks and so had
to be familiar with that and know that a 1419 check sorter
(Read/Write direct thing) was a backup (never used it).
Regards,
Steve Thompson
On 03/24/2017 09:51 AM, Todd Arnold wrote:
303x external channels (channel director) was 158 engine with integrated
channel microcode (and no 370 microcode).
360 processors with special microcode were used in a number of things. Early
in my career, I worked on development of the IBM 3890 high-speed check sorter.
(https://en.wikipedia.org/wiki/IBM_3890) The controller in that sorter was a
360 mod 25, with all the code written in native microcode - no 360 instruction
set. It turned out to be very fast, and it was many years before IBM was able
to find anything to replace that old mod 25 with its core memory.
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