On 10/25/2018 05:37 PM, Eric Smith via cctalk wrote: > On Thu, Oct 25, 2018 at 11:45 AM Chuck Guzis via cctalk < > cctalk@classiccmp.org> wrote: > >> Didn't at least one of the more popular MPU designs employ a serial ALU? >> TMS9900? >> > I don't think the TI TMS9900 was bit-serial internally, but the RCA CDP1802 No it the 9900 definitely is not. The 9900 does have that odd serial bit addressed CRU interface.
The 1802 has been verified has a serial ALU. > and National Semiconductor SC/MP (ISP-8A/500) and SC/MP II (ISP-8A/600) > were. I have no information that the SC/MP or SC/MP II more so are internally serial. The do have a serial register to the outside.. There are very few CPUs that had serial insides. Allison
