On Thu, 8 Apr 1999, Arfon Gryffydd wrote: Its a ALU and register set all 4 bits wide and cascadable. A bunch of them and a few pounds(kilograms) of TTL and other goodies later and you have a computer. Lookup a 74181 alu (it's nearly the same) and hang 2 four bit registers around it and a 4bit by 16 nibble ram and thats a 2901. IT's very useful for cooking up all sorts of interesting cpus or their look alikes. And in the late 70s early 80s it's 10mhz speed made for potentially fast cpus or specialized number crunchers. It was also used in DEC FPPs for the PDP-11 series. I still have a fat handful of them around. Allison

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