Mitsubishi ML-G30 Model 2
This page was last modified 10:34, 17 May 2022 by Gdx. Based on work by Mars2000you and SPMNT and others.



The ML-G30 Model 2 is a very professional MSX2 computer with a separate keyboard and many connectors. It has been released in 2 different colors (white and black).

This machine is an improved version of the ML-G30 Model 1 computer as it has 2 built-in disk drives and a RS-232C interface with switch at the back of the computer and its own ROM; it looks very similar to the Hitachi MB-H70.

The panel at the back with the sound and video connectors will be different if you install the ML-35AV Audio-Video interface with superimposing, digitizing and Telop capacities.

This computer has been adapted for the Spanish market with less RAM and only one disk drive - see ML-G3.

Brand Mitsubishi
Model ML-G30 Model 2
Year 1985-08
Region Japan
Launch price ¥208,000
RAM 128kB in slot 3-2
VRAM 128kB
Media MSX cartridges, 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-SYSTEMII S3527)
Chipset Yamaha S3527
Keyboard layout QWERTY/JIS + numeric keypad
Extras Two 720kB 3,5" floppy disk drives, external disk drive connector, third cartridge slot, Reset button, Kanji-ROM level 1, RS-232C interface in a fourth cartridge slot + switch + RS-232C BASIC, sold with disk Melbrains Note (Word Processor + Calc + Graphic Editor + Communication Program)
Emulation ROMs dumped and emulated


Mitsubishi ML-G30 Model 2 white
Mitsubishi ML-G30 Model 2 label
Mitsubishi ML-G30 back
Mitsubishi ML-G30 Model 2 black
Mitsubishi ML-G30 main PCB
ML-G30 Model 2 RS-232C PCB
ML-G30 internal cartridge slots
ML-G30 internal cartridge slots
ML-G30 internal cartridge slots
ML-G30 manuals + floppy disk
Mitsubishi ML-G30 keyboard
ML-G30 reset button + right side
Mitsubishi ML-G30 Model 2 box
Mitsubishi ML-G30 back with the ML-35AV interface installed


The ML-G30 Model 2 is a MSX2 with three or four cartridge slots (1 external in front and 2 or 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 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
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM Disk ROM RS-232C
Page 0000h~3FFFh Sub-ROM
  • The RS-232C ROM is a 8KB ROM - 4000h-5FFFh (is mirrored from 6000h-7FFFh)


  • 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
  • RS-232C connector (DB-25) (with an ON/OFF switch which probably turns off the slot in which the card is inserted)
  • Data Recorder connector
  • External disk drive 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 used by 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)