Sinclair Cambridge Programmable    
~1977

Batteries:	9V (PP3 battery) - a "pregnant" model.
	
Display:	8 digits, red LED (by National Semiconductor).
IC:			National Semiconductor MM5799EHY/N and DS7784N.

Size:		50 mm x 111 mm x 28 mm.

	

	
Radio Shack EC-4001 	

The Radio Shack EC-4001 model was supplied by Sinclair 
to the U.S. "Radio Shack" chain of electronics stores.