Mitsubishi ML-G30 Model 1
This page was last modified 13:41, 13 April 2023 by Sdsnatcher73. Based on work by Mars2000you 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
Model ML-G30 Model 1
Year 1985-08
Region Japan
Launch 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 S3527)
Chipset Yamaha S3527
Keyboard layout QWERTY/JIS + numeric keypad
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 (MSX-DOS 1 + Word Processor + Calc + Graphic Editor + Communication Program)
Emulation ROMs dumped and emulated


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
ML-G30 Model 1 box + content
ML-G30 manuals + floppy disk
Mitsubishi ML-G30 Model 1 label
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 S3527 from Yamaha.

The ML-G30 has support for 5.25" disk drives (The Japanese manual calls them 5" drives which is common in Japan). It won't support more than 2 drives so if you connect the external drives through the connector on the back you have to disconnect the internal drives. This will also work for external 3.5" drives (but there is no gain over the internal drives).

About the 3 internal slots:

  • The optional RS-232C card is located at back side top slot number 3-3. This slot can be disabled by the RS-232C switch at the unit rear.
  • The back side slot at the middle corresponds to slot 3-1.
  • The lowest back slot is slot 2.
  • Cartridges with case can't be inserted in these slots.

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 including one reseved for the RS-232C interface)
  • Power plug for main power supply (JIS C 8303 class, AC 100V +/-10% 50/60Hz)
  • Power outlet for monitor (AC 100V)


In the ROM that contains Disk Basic, the following text can be found that reveals some people who worked on it:

This bios program is coded by T.Osada
This hardwear is developed by M.Ishikura
This casing is designed by N.Miyazaki
Consumer's electric product development section