Mitsubishi ML-G30 Model 1
This page was last modified 16:27, 28 June 2021 by Mars2000you. Based on work by Rderooy and Gdx and others.



The ML-G30 Model 1 is a very professional MSX2 computer with a separate keyboard and many connectors. It has been released in 2 different colors (white and black). It was first shown to the public at the Japan Electronics Show '85 (Oct 17-22).

This machine has only 1 built-in disk drive, but there are locations to add a second disk drive and an internal RS-232C interface (that will occupy one of the internal slots).

The back of the computer has a RS-232C switch that is inoperable as long as the interface is not added. The panel with the sound and video connectors will be different if you install the ML-35AV Audio-Video interface with superimposing, digitizing and Telop capacities.

The following upgrade options were available

Product Price Description
Mitsubishi ML-21RS ¥16,800 RS-232C serial interface board
Mitsubishi ML-30FP ¥39,800 720kB 3.5" internal disk drive
Mitsubishi ML-30FPW ¥39,800 720kB 3.5" internal disk drive (white)
Mitsubishi ML-35AV ¥20,000 Audio/Video interface board

Brand Mitsubishi
Type ML-G30 Model 1
Year 1985-08
Region Japan
Original price ¥168,000
RAM 128kB in slot 3-2
VRAM 128kB
Media MSX cartridges, 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Keyboard layout QWERTY/JIS
Extras One 720kB 3,5" floppy disk drive (the second was sold separately), external disk drive connector, third and fourth cartridge slots, Reset button, Kanji-ROM level 1, (optional) RS-232C interface in the fourth cartridge slot + switch, sold with disk Melbrains Note (Word Processor + Calc + Graphic Editor + Communication Program)
Emulation emulated in blueMSX (except the extra cartridge slots) - ROM dump needed for openMSX. See this thread for details


Mitsubishi ML-G30 Model 1
Mitsubishi ML-G30 PCB
ML-G30 Model 1 box
ML-G30 Internal cartridge slots
ML-G30 Internal cartridge slots
ML-G30 Internal cartridge slots
Mitsubishi ML-G30 Model 1
Mitsubishi ML-G30 keyboard
Mitsubishi ML-G30 back
Mitsubishi ML-G30 Model 1 box and content
Mitsubishi ML-G30 Model 1 manuals and floppy disk
Mitsubishi ML-G30 back with the ML-35AV interface installed


The ML-G30 Model 1 is a MSX2 with four cartridge slots (1 external in front and 3 internal in back), a Z80A from NEC (D780C-1) and an MSX-Engine S1985 from Yamaha.

About the 3 internal slots:

  • Back side top slot corresponds to slot 3.3 and is reserved for the optional RS-232C interface
  • The back side slot at the middle corresponds to slot 3.1.
  • The lowest back slot is slot 2.

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
back slot
back slot
back slot
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM Disk ROM
Page 0000h~3FFFh Sub-ROM


  • RF output (removed if you install the ML-35AV interface)
  • RGB output
  • Analog sound & Composite video (replaced if you install the ML-35AV interface)
  • Keyboard connector
  • Data Recorder connector
  • External disk drive connector
  • Expansion unit connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mouse, Paddle controlers, etc)
  • 4 cartridge slots (1 external, 3 internal)
  • Power plug for main power supply (JIS C 8303 class, AC 100V +/-10% 50/60Hz)
  • Power outlet for monitor (AC 100V)