Mitsubishi ML-G30 Model 1
This page was last modified 00:06, 5 January 2023 by Mars2000you. Based on work by Gdx and Manuel 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 seems to be able to support up to four floppy disk drives using the ML-30FD. Jumpers DS0-DS3 under drives must be set to select the drive numbers. (Confirmation is required.)

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