Toshiba HX-51
This page was last modified 16:18, 24 February 2018 by Mars2000you. Based on work by Gdx and Rderooy and others.

Contents

Description

The HX-51 computer has been conceived as a very simple MSX1 computer, in a white case.

This model was aimed at the Italian and Spanish markets, but the keyboard is "international". This computer seems to be the 'remake' of the HX-30, with an obvious difference : the original case is black, while the HX-51 case is white.

Brand Toshiba
Type HX-51
Year 1985
RAM 64kB split between slots 0 and 3
VRAM 16kB
Media Cartridges
Video Toshiba T6950 Texas Instruments TMS9918 compatible (Integrated in MSX-Engine T7937)
Audio PSG-sound chip General Instrument AY-3-8910 compatible (Integrated in MSX-Engine T7937)
Chipset Toshiba T7937
Extras

Pictures

Toshiba HX-51
Toshiba HX-51 label
Toshiba HX-51 box
Toshiba HX-51 left side
Toshiba HX-51 back
Toshiba HX-51 right side

Specifications

The HX-51 is a MSX1 computer with 2 cartridge slots (one at the top, one at the back). Main components (CPU, VDP, PSG) are integrated in a MSX-Engine, the Toshiba T7937 a Z80A integrated in MSX-Engine T7937 from Toshiba. It's actually the first time that such integration happens on MSX.

The 2 joystick ports are located on the right side of the computer, as well as the data recorder connector.

The integrated VDP is the Toshiba T6950, which does not support some undocumented features of the Texas Instruments TMS9918, TMS9928 and TMS9929 VDP's.

The 64kB RAM is split between slots 0 and 3, a configuration that can cause poorly written software to crash. Also, with this layout, the POKE-1,(15-PEEK(-1)\16)*17 trick to workaround buggy software that does not handle subslots properly will not work on this machine.

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3
Bank C000h~FFFFh Upper
32kB RAM
Cartridge
Slot 1
Cartridge
Slot 2
Bank 8000h~BFFFh
Bank 4000h~7FFFh Main-ROM Lower
32kB RAM
Bank 0000h~3FFFh

Connections

  • RF output
  • Tape data recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mouse, Graphic pad, Paddle controlers, etc)
  • 2 MSX cartridge slots