The only difference compared to the FM 77 AV seems to be an improved 3.5" disk-drive with a capacity of 640 kb.
Like the FM 77 AV, there were two models : the FM 77 AV 20-1 with one disk-drive, and the FM 77 AV 20-2 with two.
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NAME
FM 77 AV 20
MANUFACTURER
Fujitsu
TYPE
Home Computer
ORIGIN
Japan
YEAR
1986
BUILT IN LANGUAGE
Unknown
KEYBOARD
Infra red professionnal keyboard with numeric keypad, arrow keys and function keys
CPU
MBL 68B09E x 2
SPEED
2 Mhz
CO-PROCESSOR
Unknown
RAM
128 kb (up to 192 kb)
VRAM
96 kb
ROM
Unknown
TEXT MODES
Unknown
GRAPHIC MODES
640 x 200 (8 colors), 320 x 200 (4096 colors)
COLORS
4096
SOUND
3 FM voices + 3 PSG voices
SIZE / WEIGHT
Unknown
I/O PORTS
RS232x, parallel/centronics, external FDD, stereo audio output, scart video output...
BUILT IN MEDIA
one (FM 77 AV 20-1) or two (FM 77 AV 20-2) 3.5'' disk-drives
OS
Unknown
POWER SUPPLY
PSU built-in
PERIPHERALS
Unknown
PRICE
FM-77 AV 20-2 : 168,000 yen (Japan, 1986) FM-77 AV 20-1 : 138,000 Yen (Japan, 1986)
