Mitsubishi ML-G1
This page was last modified 17:55, 5 July 2023 by Mars2000you. Based on work by Gdx and Rderooy and others.




The ML-G1 is the adaptation of the ML-G10 computer for the Spanish market.

It's a machine without any drive and with only 64Kb RAM.

The expansion bus is present on the mainboard as on the ML-G10 but the connector is not soldered.

It is still used in some parts of Spain for the Driver's License Test on cartridge, combined with a box containig handlers connected to simulate the future driver hand-eye coordination. Other MSX2 computers used for that are Philips NMS 8245 and Sony HB-F9S.

Brand Mitsubishi
Model ML-G1
Year 1986
Region Spain
Launch price
RAM 64kB in slot 3-2
VRAM 128kB (64kB on mainboard + 64kB on VRAM expansion board)
Media MSX cartridges
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S3527)
Chipset Yamaha S3527
Keyboard layout QWERTY with "ñ " and accents keys + numeric keypad
Extras Reset button, graphic tool 'Hot Paper'
Emulation ROMs dumped and emulated


The firmware is launched automatically when you boot the machine. Bypassing this software on startup requires the user to press the DEL key during boot until a Beep sound. You need also to press this key when a memory extension is inserted in this machine.

The built-in software is a graphic application in screen 7. Its name is 'Hot Paper". Some features are only working with the ML-85AV interface, that was not sold outside Japan.



Mitsubishi ML-G1
Mitsubishi ML-G1 PCB
Mitsubishi ML-G1 right side
Mitsubishi ML-G1 label
Mitsubishi ML-G1 + Driver Test box
Mitsubishi ML-G1 back with the case cut to add the expansion bus


Mitsubishi ML-G1 firmware

Spanish Driver Test

Driver Test - intro
Driver Test - main menu
Driver Test - anticipation speed
Driver Test - bimanual visual-motor coordination
Driver Test - times of multiple reactions
Driver Test - concentrated attention
Driver Test - concentrated attention
Driver Test - option menu for results
Driver Test - results menu


The ML-G1 is a MSX2 with two cartridge slots (top and rear), a Z80A from NEC (D780C-1) and an MSX-Engine S3527 from Yamaha.

It is necessary to press the "DEL" key at startup when a memory expansion is inserted otherwise the computer freezes.

Slot Map

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 Hot Paper
Page 0000h~3FFFh Sub-ROM