Casio MX-10
This page was last modified 12:27, 18 June 2022 by Mars2000you. Based on work by Sdsnatcher73 and Gdx and others.
Casio MX-10.png



The MX-10 is the successor of the Casio PV-16 with the same characteristics but with an exception: to make the computer as small as possible, the tape interface was removed from the machine as with the PV-7. As a result, the MX-10 requires the FA-32 or FA-33 CMT I/F package in order to use a cassette recorder. It was first shown to the public at the Japan Electronics Show '85 (Oct 17-22).

Other differences are the placement of the cursor keys and a cheaper price, justified by the presence of the more sophisticated MSX2 machines out at the time. The quality of the chiclet keyboard is as questionable as its predecessor, but with cheaper rubber keys instead of hard plastic.

The joypad keys are arranged in a diamond shape (instead of a circle) without the 'Joypad 1' indication. Together with the TR1 and TR2 keys on the bottom left of the computer, these are equivalent to a joystick inserted into joystick port 1. It is likely that only games that use BIOS routines to handle the joysticks are supported by this internal joypad, including BASIC games which use the STICK command (though has not been confirmed).

Apart from the 'Joypad 1' keys, the computer also features normal cursor keys aligned above the joypad keys. There may be a "Type B" sticker on the left side just below the keyboard, this just means it has two separate joystick trigger buttons.

It is possible to add two cartridge slots and a printer port by combining the MX-10 with the KB-10 expansion unit. The MX-10 does not use an internal power supply; the provided AC power adaptor (AD-4175) is required if the KB-10 unit is not used, which has its own power supply.

This machine was aimed at the Japanese market. Both the computer and the expansion unit were available in black (BK) and red (RD) colors. This machine was adapted for the international market as the MX-15.

Brand Casio
Model MX-10
Year 1985
Region Japan
Launch price ¥19,800 computer
¥13,800 KB-10 expansion unit
¥3,000 FA-32 data recorder adapter
RAM 16kB in slot 0 (with or without KB-10)
Media MSX cartridges
Video Texas Instruments TMS9118NL
Audio PSG (AY-3-8910)
Chipset None (separate ICs whose a gate array Hitachi HG61H06)
Keyboard layout QWERTY/JP50on
Extras Two specific keys TR1 and TR2, Joypad 1 cursors, (with KB-10) third cartridge slot
Emulation ROM dumped and emulated. Note that the emulation includes the FA-32 cassette interface


Casio MX-10 RD
Casio MX-10 PCB underside
Casio MX-10 PCB
Casio MX-10 BK
Casio MX-10 left side
Casio MX-10 right side
Casio MX-10 box and content
Casio MX-10 box
Casio MX-10 box (back)
Casio MX-10 AC adapter and manual
Casio MX-10 back (detail)
Casio MX-10 label


The Casio MX-10 is an MSX1 system with a Z80A clone manufactured by NEC (DA780C-1) and a Hitachi HG61H06 gate array (seems to implement at least the PPI).

The pins SW1, SW2, -12V and +12V of the cartridge connector are not connected. In general, MSX systems without a protection switch have pins SW1 and SW2 connected to GND. A few rare cartridges use SW1 and SW2 as GND and some cartridges require the -/+12V rails, such as the FM-PAC.

The AC power adaptor output is 7V with tip negative polarity, and puts out 800mA. It is not used when the computer is connected to the KB-10 expansion unit, which has its own internal power supply.

Slot Map without KB-10

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Cartridge
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh

Slot Map with KB-10

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Cartridge
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh


  • RF output
  • Analog sound output (mono)
  • Composite video output
  • MT/IF connector (requires the FA-32 or FA-33 CMT I/F package in order to connect a standard tape recorder)
  • Centronics compatible Parallel port for a printer (on the left side of the expansion unit KB-10)
  • 2 general connectors (Joysticks, Mice, Paddle controllers, etc)
  • One cartridge slot (without the KB-10) or three cartridge slots (with the KB-10)
  • expansion bus slot for the KB-10 unit
  • AC power adaptor connector