Fujitsu FM-X
This page was last modified 08:57, 13 April 2019 by Rderooy. Based on work by Gdx and Mars2000you and others.

Contents

Description

The Fujitsu FM-X (or MB25150 as indicated on the label) is one of the first MSX models to be released, and the only MSX computer ever made by Fujitsu. Fujitsu had another competing computer range, in the form of the FM-7, FM-8 and FM-77, which were based on a Motorola 6809 processor.

The FM-X has only 16kB RAM and lacks a printer interface. However, it is possible to add this interface and an additional 16kB RAM by inserting the Fujitsu MB22451 cartridge in the 60-pin expansion slot.

This slot can also be used to connect the FM-X to the FM-7 by inserting the Fujitsu MB22450 interface. This combination extends the capabilities of both computers.

This model has an internal speaker.

The official price is ¥49,800 (and ¥126,000 for the FM-7).

Size: 380 x 245 x 80 mm (WxLxH)
Weight: 2.6 kg

Brand Fujitsu
Type FM-X or MB25150
Year 1983-12
Region Japan
Original price ¥49,800
RAM 16kB in slot 0
VRAM 16kB
Media MSX cartridges
Video Texas Instruments TMS9928ANL
Audio PSG (AY-3-8910)
Chipset none (separate IC's)
Extras Expansion slot with a 60 pin connector, reset button, switch to select video source, built-in speaker

Pictures

Fujitsu FM-X
Fujitsu FM-X back
Fujitsu FM-X right side
Fujitsu FM-X front
Fujitsu FM-X expansion slot
Fujitsu FM-X PCB
Fujitsu FM-X with printer interface
Fujitsu FM-X box
Fujitsu FM-X underside (with printer interface underside)
Fujitsu FM-X with FM-7 interface
Fujitsu FM-X label
Fujitsu FM-X RGB colors

Specifications

The FM-X is a MSX1 with a Z80A from Zilog (Z08400A).

Although it has a standard Texas Instruments TMS9928ANL VDP, the RGB colors are different because an additional circuit reworks the palette to be the same as used on the Fujitsu FM-7. It's encoded in 3-bit RGB, reducing the palette from 16 colors to 8 colors.

When using the CVBS input of a monitor, the same color limitation can be seen, but the colors are even more different, very close to CGA or ZX-Spectrum.

Slot Map without Fujitsu MB22451 or MB22450

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Expansion
Slot
Cartridge
Slot
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh

Slot Map with Fujitsu MB22451

Help needed
The below slot-map is an assumption, it needs to be checked on a real machine.
Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Cartridge
Slot
Page 8000h~BFFFh RAM
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh

Slot Map with Fujitsu MB22450

Help needed
The below slot-map is an assumption, it needs to be checked on a real machine.
Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Cartridge
Slot
Page 8000h~BFFFh Part of
FM-7 RAM
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh FM-X BASIC

Connections

  • RF output
  • TTL Digital RGB output (DIN 45326, 8 pin)
  • TTL Digital RGB input (6 pin)
  • Analog sound output (mono)
  • Tape recorder connector
  • 2 general connectors (Joysticks, Mouse, Paddle controlers, etc)
  • One MSX cartridge slot (on right side, using slot 2)
  • One 60 pin expansion slot (on left side, occupying slot 1) to use for specific module

Links