17 Sep
2016
17 Sep
'16
9:23 a.m.
On Fri, Sep 16, 2016 at 5:41 PM, Chuck Guzis <cclist at sydex.com> wrote:
The TMS9900 has already been identified as a 16-bit
ISA, even with its
bit-serial ALU.
I don't know what the width of the TMS9900 ALU is, but I'm pretty sure
it's not bit-serial, as an add instruction only takes 14 clock cycles,
including four memory cycles. I'd be very surprised if the ALU isn't
either 8 or 16 bits, though 4 might be possible.
Possibly someone is confused by the bit-serial "CRU' I/O space, but
that is unrelated to the ALU width.