Description
The 1100/80
used a new circuit technology known as emitter-
coupled logic, which brought about a considerable
increase in speed. The considerations
of chip placement on boards and the wiring
connections among them had become so complex
that the engineers developed new software
to do the circuit designs.
The 1100/80 was the first 1100 to use cache
memory. (IBM had introduced cache memory
on its 360/85, announced in 1968.) This was a
relatively small (maximum of 16,384 words),
very fast (45-nanosecond access time) memory
in a separate module that could be accessed by
any processor in the system.
