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In 1979, the British magazine Wireless World published the technical details for a "Scientific Computer". Shortly afterward the British firm Powertran used this design for their implementation, which they called the PSI Comp 80. It was sold in the form of a kit of parts for a cased single-board home computer system. The system was based on a Z80 Microprocessor addressing a mixture of 8 KB of system RAM and EPROM, plus 2 KB of Video RAM. It used a National Semiconductor MM57109N as a mathematical co-processor to speed up calculations.

 

 
Powertran PSI Comp 80 (SC84)
Powertran PSI Comp 80 (SC84)
 
 
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