Toshiba HX-20

The Toshiba HX-20 was a compact MSX1 computer that developed the Pasopia IQ range with 64 KB of RAM and the standard MSX cartridge, cassette, joystick and display interfaces.

It formed part of Toshiba’s expanding MSX range and offered a more compact successor alongside the widely exported HX-10 family.

Notable Features

• MSX1 software and cartridge compatibility
• 64 KB memory suited to disk-based software
• Compact keyboard-console enclosure

Historical Significance

• It formed part of Toshiba’s expanding MSX range and offered a more compact successor alongside the widely exported HX-10 family.

Collector’s Notes

• Suffixes and regional editions can alter video output and keyboard legends; confirm the exact model before assigning detailed specifications.
• Memory, storage, displays and expansion hardware should be documented because configurations often changed during a system’s working life.

Specifications

Technical Information
Name	Toshiba HX-20
Manufacturer	Toshiba
Launched	Sunday, January 1, 1984
Country	Japan
CPU	Zilog Z80A
Units Sold
Form Factor	Keyboard console
Power	External power supply
Networking	None built in
Operating System	MSX BASIC
Expansion / I/O	Cartridge, cassette, two joystick ports, printer and display outputs
Keyboard	Integrated keyboard
Storage	Cartridge and cassette; optional floppy disk
Sound	AY-3-8910-compatible three-voice PSG plus noise
Colours	16
Graphics	TMS9918-family video: 256 x 192 pixels with sprites
Display	Television or monitor
ROM	32 KB MSX BIOS and BASIC
RAM	64 KB
CPU Speed	3.58 MHz