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E > EPSON  > PX 4 / HC 40   

PX 4 / HC 40

This computer is the successor of the HX-20.

The main cosmetic difference is a wider screen that can be adjusted to the right angle.

There are 2 ROM slots under the machine to implement additional ROM programs.

On the right of the LCD display can be plugged a tape-recorder, a plotter, RAM expansions, a lot of things or ... nothing.

A lot of peripherals were available for this little computer (see hardware page), at least in japan.

The PX-4 was logically followed by the PX-8.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


I have one of these in a box somewhere, along with the PROM writer...... very funky little unit, well ahead of its time.

Thursday 29th March 2012
Simon (Australia)

When I did A-level computing in 1990, I remember doing a case study of how the UK music singles chart worked. Shops entered details of sales into little computers, and I remember that the Epson PX-4 was specifically named. No idea if it was true, though!

Friday 4th May 2007
Ian Chard (UK)


NAME  PX 4 / HC 40
TYPE  Portable
YEAR  1984
KEYBOARD  Full-stroke keyboard (chicklet keyboard available)
CPU  uPD 70008 (Z80 compatible )
SPEED  3.6864 MHz
CO-PROCESSOR  CMOS 7508 4bit : handles housekeeping, clock, battery, etc.
RAM  64 KB : 64 Kbit CMOS D-RAM x 8
ROM  96 KB : 256 K-bit CMOS ROM X 3
TEXT MODES  40 x 8
COLORS  Monochrom LCD display
SOUND  Beeper
SIZE / WEIGHT  A4 size
I/O PORTS  Serial, RS232c, cassette, cartridge port, printer (parallel) port, expansion port, sound in & out
BUILT IN MEDIA  Microcasette
OS  CP/M with disk-drives units
POWER SUPPLY  Built-in battery which can last for 4 hours
PERIPHERALS  Printers, plotters, tape-recorder, ROM & RAM expansion, barcode reader, EPROM burner, replacement keyboard, modem and more...
PRICE  1590 FF (France, january 1988)

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Ready prompt
ZX Spectrum
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
Vector ship

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