Panasonic FS-A1GT
This page was last modified 16:32, 5 January 2017 by Rderooy. Based on work by Mars2000you and Gdx and others.
Brand Panasonic
Type FS-A1GT
Year 1992
RAM 512kB, 32kB SRAM
VRAM 128kB
Media 720kB 3,5" floppy disk drive
Video Yamaha V9958
Audio PSG (AY-3-8910 compatible), MSX-MUSIC, PCM, MSX-MIDI
Chipset Toshiba T9769C and NEC S1990 bus controller
Extras Microphone, MSX-JE, Kanji-ROM level 1 & 2, Pause key, Ren-Sha Turbo (autofire), MSX-DOS2 and MSX-View with some software, Kanji BASIC
Panasonic FS-A1GT
MSX turbo R logo



The Panasonic FS-A1GT MSX turbo R is the last MSX computer produced and it follows the latest standard for the MSX line. The FS-A1GT was preceded by the FS-A1ST. Compared to the FS-A1ST, the FS-A1GT has double the amount of RAM (512kB). It also features a MIDI-IN and MIDI-OUT connector. The FS-A1ST can also be upgraded to the FS-A1GT using the μ.Pack. MIDI can also be accessed through MSX-BASIC (PLAY#1).

Note: there's a bug in the MSX-MUSIC implementation of a Panasonic FS-A1GT. This problem only occurs when a CALL MUSIC is done without any OPLL channel, e.g. CALL MUSIC(0,0) and then a tempo MCL issued (e.g. PLAY"T120") OR when a program is stopped by CTRL-STOP. In these cases, a crash occurs. The problem can be avoided by doing a CALL MUSIC(0,0,1). This problem doesn't occur on the Panasonic FS-A1ST MSX turbo R.

Due to some minor hardware bugs that were discovered, the mainboard is a bit different: e.g. the MSX-MUSIC part is redesigned to decrease influence of the noise from other digital parts, although it's confirmed this was also corrected in the last batch of the A1ST.


The FS-A1GT is a MSX of intermediary generation with 2 CPU (Z80A & R800) and many options included. A single CPU may be used at a time by switching. The R800 has two operating modes (Mode RAM & Mode ROM).

Detailed Specifications

  • CPU R800 (DAR800-X0G), with 28.63630 MHz external clock and 16-bit ALU. (Can be accelerated to 40MHz by changing the crystal.) Note: the CPU clock is 7.15909MHz (external clock divided by 4) and the bus frequency is 3.579545MHz, however, an instruction on the R800 that takes 1 bus clock cycle, often takes 4 clock cycles on the Z80, so one can indeed say that the R800 runs roughly like a 28.6 MHz Z80.
  • CPU Z80A 3.579545MHz compatible (included in the MSX-Engine)
  • 512kB of main RAM
  • 32kB SRAM for backup (used internally or by MSX-View as SRAM disk) (holding ESC during boot will erase settings, FS-A1ST will keep settings ^^)
  • 32kB BASIC/BIOS ROM and 32kB subROM (MSX-BASIC V4.1, with extra command _PAUSE to make delays in BASIC independent of the current CPU, extra commands for the PCM device (_PCMPLAY, _PCMREC)) and MSX-MIDI, 16kB DISK ROM, 48KB MSX-DOS2.30 Kernel, 16kB FM-BASIC ROM, 16kB KANJI BASIC.)
  • TC8566AF disk controller
  • 3.5" double sided double density (720kB) disk drive
  • S1990 MSX Bus-controller
  • T9769C MSX-ENGINE (also contains Z80A & AY-3-8910)
  • MSX-JE (a simple Kanji input interface)
  • Kanji-ROM with approx. 32000 characters
  • MSX-Music (Yamaha YM-2413 OPLL)
  • PCM synthesizer 8-bit (sample rate 16kHz)
  • Internal microphone for the PCM unit
  • MSX-MIDI interface built-in (not compatible with MIDI-Saurus!) Includes 8251 (UART) and 8254 (timer) with 16kB MIDI-BASIC ROM and MIDI-IN / MIDI-OUT connectors. Also available as a cartridge for FS-A1ST.
  • MSX-VIEW ('MSX-Windows') developed by ASCII & HAL. Software as Page Edit, PageView, Page Link, VShell, VTed, VPaint and VDraw) on 512kB ROM DISK (C: drive). Also available as a cartridge for FS-A1ST. Internal software can be accessed from BASIC with command CALL MWP
  • Pause key (software in R800-mode, hardware in Z80-mode)
  • Reset button
  • 6 LEDs (power, caps-lock, kana-lock, pause, CPU mode, FDD in use)


  • 2 cartridge ports
  • 2 general connectors (joysticks, mouse, etc)
  • RGB output
  • S-video (aka Y/C) output
  • MIDI output
  • MIDI input
  • Centronics compatible Parallel port for a printer
  • External microphone connector (input, mono)
  • 100V +/-10% 50/60Hz main power
  • No cassette connector

Note: ASCII paddle controllers are no longer supported by the MSX Turbo R BIOS.

Included software disks

  • Sound editor, spoken samples for the word processor and a drawing tool
  • Software for MSX-View (ViewTed, ViewDraw, ViewPaint, printer drivers, etc)
  • MSX-DOS v2.31 with tools


FS-A1GT front side
FS-A1GT back side
FS-A1GT box
FS-A1GT manuals and disks
FS-A1GT official flyer


Replacing the old FDD belt of Panasonic MSX2+ and turbo R. (sold on ebay, model Panasonic DFWV75C0009).

Original 24-pin FDD flatcable: Sumitomo-Y AWM 2896 80C VW-1 (100mm, 1.25mm pitch)

Alternative 24-pin FDD flatcable: AWM 20624 80C 60V VW-1 (100-200mm 1.25mm pitch)