Fujitsu FM77AV20EX

The Fujitsu FM77AV20EX refined the AV20 with faster memory access and expanded audio-visual options. It retained the 4,096-colour display and 640KB disk format while improving responsiveness in software designed for the enhanced memory controller.

The EX generation also supported video digitisation, extending the FM77AV’s role in home graphics and image work. It remained compatible with much of the earlier FM software library.

Notable Features

• Enhanced memory access could improve speed by roughly 25 percent.
• Added support for video digitisation hardware.

Historical Significance

• Kept the lower-cost AV20 line competitive as 16-bit machines grew more common.
• Shared the EX generation’s software improvements with the AV40EX.

Collector’s Notes

• Video digitisation hardware may be optional depending on configuration.
• EX-specific capabilities require suitable software.

Specifications

Technical Information
Name	Fujitsu FM77AV20EX
Manufacturer	Fujitsu
Launched	Sunday, November 1, 1987
Country	Japan
CPU	Motorola 68B09E with accelerated memory access and Motorola 68B09 display processor
Units Sold
Operating System	F-BASIC and disk operating software
I/O	Joystick, printer, serial, expansion, RGB and audio-visual interfaces
Keyboard	Separate keyboard
Storage	One or two built-in 3.5-inch 640KB floppy drives
Sound	PSG plus FM synthesis
Graphics	320x200 in 4,096 colours; optional video digitisation
Display	RGB monitor
ROM	F-BASIC and system firmware
RAM	128KB to 192KB main RAM; 96KB video RAM
CPU Speed	Approximately 2 MHz; up to 25% faster with memory mapping