15 Feb
2021
15 Feb
'21
2:46 a.m.
Anyone ever heard of the Systems Concepts SC-4 computer?
"This is an two's-complement 18-bit machine, with 16 general registers
and a 16 level priority interrupt system. Its programming ascpects
are explained in great detail in the SC-4 Reference Manual, of which a
draft is enclosed. Below are times for some typical instructions.
Add word on stack (not top word) to general register 1.5 us
Multiply general register by memory word 6.2 us
Jump 750 ns
Push and Jump 1.5 us
Compare Immediate 750 ns"
From page 6 here:
http://people.csail.mit.edu/saltzer/Multics/MHP-Saltzer-060508/filedrawers/…