Uploaded August 2025 | Updated September 2026, 1 week ago

---

Brand: EPSON
Origin: Japan
Year of introduction: 1981
End of production: 1986?
CPU: 2x Hitachi 6309
Speed: 0.614MHz
RAM: 16kB
ROM: 32kB
Colors: 2
Sound: Beeper
OS: Monitor &
Microsoft Basic - Epson interpreter
Display modes:
Text: 4x20
Graphics: 120x32 dots
Video: Built-in LCD screen only.
Media: ROM cartridge
Modular micro-cassette recorder (optional)
External tape recorder (optional)
Power supply: Male DC jack at the computer:

1 - +9V DC 0.6A (UNREGULATED)
2 - GND

====================================

I/O: Serial
Tape IO
Barcode scanner in
RS232C
System bus
============================================
Manual :
files.support.epson.com/pdf/hx20__/hx20__u1.pdf

Opinion :
feertech.com/legion/retro/computer/2021/07/12/epson-hx20.html

Wikipedia :
en.wikipedia.org/wiki/Epson_HX-20

Programs :
geocities.ws/abcmcfarren/hx20/hx20.htm