Casia Tyzack 64-M
This page was last modified 02:17, 29 May 2023 by Mars2000you. Based on work by Rderooy and Fondacio.



The Casia Tyzack 64-M was constructed between 1987 and 1990 by the Dutch company Casia. It is basically a combination of a modified Sony HB-F9P MSX2, used as main computer, with a Toshiba HX-10P MSX1 used as sampler subsystem.

Besides, this transputer system has

  • a homebrew black and white digitizer with a resolution of 256 x 256 pixels
  • two stereo Philips SAA1099 sound generators with 6 channels per generator
  • a General Instrument SPO256-AL2 speech synthesizer (64 phonems)
  • a homebrew stereo AD/DA sampler, with its own RAM (partly inspired by the Doepfer/Elektor sampler, though much less sophisticated) - this sampler was external on the models released before 1989
  • an homebrew 48T interface for music keyboard
  • a MIDI interface (AY-3-1015 UART)
  • an RS-232C interface
  • a specific ROM that adds new instructions to BASIC - see Tyzack64M BASIC

64-M means that its RAM is theorically extendable to 64 Megabytes.

Brand Casia
Model Tyzack 64-M
Year 1987 to 1990
Region the Netherlands
Launch price
RAM 1216kB : 128kB (Sony HB-F9P) + 64kB (Toshiba HX-10P) + 1024kB (sampler RAM)
VRAM 144kB : 128kB (Sony HB-F9P) + 16kB (Toshiba HX-10P)
Media MSX cartridges
Video Yamaha V9938 (Sony HB-F9P) + Texas Instruments TMS9929A (Toshiba HX-10P)
Audio PSG (YM2149 integrated in MSX-Engine S1985) (Sony HB-F9P) + PSG (AY-3-8910A) (Toshiba HX-10P)
Chipset Yamaha S1985 (Sony HB-F9P) + Toshiba TCX-1007 (Toshiba HX-10P)
Keyboard layout QWERTY with a "£" key + numeric keypad
Extras two stereo Philips SAA1099 sound generators, General Instrument SPO256-AL2 speech synthesizer, stereo AD/DA sampler, black and white digitizer, interface for music keyboard, MIDI interface, RS-232C interface, Tyzack64M BASIC, reset button
Emulation not applicable


Casia Tyzack 64-M
digitizer and sampler
Casia Tyzack 64-M + 48T music keyboard
Casia Tyzack 64-M inside


Main computer

The Sony HB-F9P is an MSX2 with a Z80A from Sharp (LH0080A) or NEC (uPD780C) and an S1985 MSX-Engine from Yamaha.

Sampler subsystem

The Toshiba HX-10P is an MSX1 with a Z80A from Sharp (LH-0080A).


  • RF output
  • RGB output (8-pin DIN)
  • Monitor connectors
  • Audio output connectors
  • Audio input connector
  • Video input connector
  • Keyboard connector
  • Tape recorder connector
  • RS-232C connectors
  • MIDI connectors
  • Connector for music/sampler keyboard
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (joysticks, mouse, paddle controllers, ...)
  • 2 cartridge slots
  • 220V AC Power socket