
The Cambridge Programmable was my first programmable calculator. I ordered it out of a dubious advertisement in the back of a magazine. It was not overly expensive and one of those ‘8-10 week’ delivery items that you are never sure if it will actually arrive. Overall, it seemed too good to be true but once
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Sold by Digi-key and listed in their magazine advertisements from Summer 1978 through summer of 1979. Included ROMs with National Semiconductor’s NIBL basic.
National Semiconductor’s Low Cost Development System for SC/MP based computers.

Originally from Steve Ciarcia’s Circuit Cellar, BYTE August 1981