On 10/25/18 11:33 AM, Al Kossow via cctalk wrote: > > > On 10/25/18 10:45 AM, Chuck Guzis via cctalk wrote: > >> Didn't at least one of the more popular MPU designs employ a serial ALU? >> TMS9900? > > You've mentioned this a couple of times. > > Are you confusing this with the serial CRU I/O scheme TI computers used? > I double-checked and the 960,980 and 990 minicomputers are all 16 bit > parallel machines. > > The 9980/1 and 9995 had an 8 bit memory bus but internally are 16. > > I double-checked, and the TMS9900 has a 16 bit ALU (page 6 in > TMS_9900_Microprocessor_Data_Manual_May76.pdf on bitsavers)
Dunno, the mind is foggy on this detail, since I never played with the beast. But it seems to me that there was at least one "too slow" MPU out there in production at some point. --Chuck
