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Micro Expander information


Micro Expander Model 1
DeveloperLee Felsenstein
ManufacturerMicro-Expander, Inc.
TypeMicrocomputer
Release dateMay 1981; 43 years ago (1981-05)
CPUZilog Z80A at 4 MHz
Memory64 KB of RAM stock (expandable to up to 512 KB)
PredecessorSol-20

The Micro Expander Model 1 (also known simply as the Expander[1] and sold in Europe as the PAL) is an S-100-based microcomputer introduced by Micro-Expander, Inc., in 1981. The computer was the brainchild of Lee Felsenstein, designer of the Sol-20, the first home computer. After his primary client and marketers of the Sol-20, Processor Technology, went out of business in 1979, Felsenstein founded a new company, Micro-Expander, Inc., in 1980. He gained the capital to sell his prototype of a successor to the Sol-20 as the Micro Expander Model 1 with help from some Swedish investors, primarily Mats Ingemanson, who was hired to market the computer.

  1. ^ Tebbutt 1981, p. 76.

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