16 Sep
2016
16 Sep
'16
5:37 p.m.
The TMS9900 has already been identified as a 16-bit
ISA, even with its
bit-serial ALU.
So some enterprising soul could device a shift-register-based MPU with
1-bit memory bus, but with a 256 bit word size and it would be a 256 bit
ISA?
I don't think this follows. Looking at the TMS 9900 datasheet, the block
diagram shows a full 16 bits on each ALU input and 16 bits leaving it.
There's no 1-bit bus directly to memory.
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