Toshiba HX-33
This page was last modified 02:00, 20 August 2019 by Mars2000you. Based on work by Rderooy and Manuel and others.




The HX-33 is the first MSX2 computer in the third serie with the "Pasopia IQ" label. The PSG sound output is stereo, with a switch at the back. This computer was aimed at the Japanese market, with as option a RS-232C interface with switch.

Brand Toshiba
Type HX-33
Year 1985
Region Japan
Original price ¥99,800
RAM 64kB in slot 3-0, 2kB SRAM
VRAM 128kB
Media MSX cartridges
Video Yamaha V9938
Audio PSG (YM2149F)
Chipset Toshiba TCX-2001 and TCX-2002
Extras firmware (Japanese + English Word Processor), Kanji-ROM level 1, stereo PSG sound, Printer BASIC, (optional) RS-232C interface + switch + RS-232C BASIC


The built-in firmware is a Word Processor in 2 versions: Japanese and English. From BASIC, the Japanese version can be launched with CALL JWP or _JWP and the English version with CALL EWP or _EWP. It includes the additional BASIC commands for RS-232C and printer.

The Japanese Word Processor is actually version 3.0 of the same software available in versions 2.0 and 2.5 on the Toshiba HX-2x serie.

The English Word Processor is the same as on the International versions of the HX-20 and HX-22 machines, but the option to leave the program has been removed. As it was already the case with the Japanese Word Processor, you need to reboot the computer.



Toshiba HX-33
Toshiba HX-33 back
Toshiba HX-33 main PCB
Toshiba HX-33 box


Toshiba Japanese Word Processor 3.0 - Intro screen
Toshiba Japanese Word Processor 3.0 - Menu
Toshiba English Word Processor - Menu on HX33/34


The HX-33 is a MSX2 with 2 cartridge slots (one at the top, one at the back), a Z80A from Sharp (LH-0080A) and 2 unusual MSX-Engines, the Toshiba TCX-2001 and TCX-2002. The 2 joystick ports are located on the right side of the computer, as well as the data recorder connector.

Slot Map

(note: the mapper of the firmware ROM in slot 3-3 needs to be checked)

Slot 0 Slot 1 Slot 2 Slot 3-0 Slot 3-1 Slot 3-2 Slot 3-3
Page C000h~FFFFh Cartridge
Slot 1
Slot 2
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh Sub-ROM
  • The firmware ROM is actually a 80kB ROM