High Quality Content by WIKIPEDIA articles! The Epson PX-4 (HC-40 or HX-40) is a portable CP/M based computer introduced in 1985. The screen was 40x8 characters physical, but 80x25 or 40x50 virtual, making it almost compatible with the Epson PX-8 Geneva. It was operated from a NiCD battery pack or four penlight batteries. It was targeted as successor of the Epson HX-20 portable, which was very popular with field engineers. Another feature of the PX-4 was its high modularity. Inheriting the ROM capsules from the Epson PX-8 Geneva, it added a cartridge bay (similar but incompatible with the Epson HX-20), for which Epson offered several printers, micro-cassette drive, modem, EPROM writer, DMV, RAM and ROM cartridges.

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