Yamaha CX5M II/128

The CX5M II/128 expanded Yamaha’s music computer with 128 KB RAM and the improved SFG-05 FM/MIDI module while retaining MSX1 software compatibility.

Its larger memory and refined music hardware made the CX platform more capable for composition, sequencing and education.

Notable Features

• 128 KB RAM
• SFG-05 FM synthesizer and MIDI module
• MSX1 software compatibility

Historical Significance

• Its larger memory and refined music hardware made the CX platform more capable for composition, sequencing and education.

Collector’s Notes

• Check that the SFG-05 is installed and record the matching music keyboard and software; regional labels vary.
• Memory, storage, displays and expansion hardware should be documented because configurations often changed during a system’s working life.

Specifications

Technical Information
Name	Yamaha CX5M II/128
Manufacturer	Yamaha
Launched	Tuesday, January 1, 1985
Country	Japan
CPU	Zilog Z80A compatible
Units Sold
MIDI	MIDI IN and OUT through the SFG-05
Form Factor	Keyboard console
Power	Internal or external mains supply
Networking	None built in
Operating System	MSX BASIC; MSX-DOS on disk-equipped models
Expansion / I/O	Cartridge, cassette, joystick, printer and video connections
Keyboard	Integrated keyboard
Storage	Cartridge, cassette and side-slot module
Sound	YM2149 PSG plus SFG-05 YM2164 eight-voice FM synthesis
Colours	16 on MSX1; expanded palette on MSX2/2+
Graphics	TMS9918-family 256 x 192 pixel graphics
Display	Television or monitor
ROM	MSX BIOS and BASIC plus model firmware
RAM	128 KB main RAM and 16 KB video RAM
CPU Speed	3.58 MHz