The microprocessor type varies by the CPU model:
80188 microprocessor for CPU models 311/313/323/331
80C188XL microprocessor for CPU models 340/341
80386EX microprocessor for CPU models 350–364.
The microprocessor provides all fundamental sweep and operation control, and
execution of all non-boolean (as used here, the term boolean refers to discrete logic such
as contacts and coils) functions. Boolean functions in the modular CPUs are handled by
a dedicated VLSI (Very Large Scale Integration) Instruction Sequencer Coprocessor
(ISCP). All Series 90-30 CPUs use RAM working memory.
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