Meaning of "architecture width" - Re: 68K Macs with MacOS 7.5 still in production use...

Cameron Kaiser spectre at
Fri Sep 16 19:37:08 CDT 2016

> 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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  Cameron Kaiser * Floodgap Systems * * ckaiser at
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