Panasonic FS-A1WX
This page was last modified 10:28, 22 September 2018 by Gdx. Based on work by Rderooy and Mars2000you and others.




The FS-A1WX is a computer released on the Japanese market by Panasonic. It is almost the same as the FS-A1FX but with MSX-MUSIC and a Japanese Word processor as extra, which explains why the "取消" (Cancel) and "実行" (Execute) keys have been added to the keyboard.

The Ren-Sha Turbo feature provides auto-fire mode while playing games. The repetition speed can be adjusted with a slider.

This model was available in black. Official price: ¥69,800

It was also sold in a special bundle (FS-A1WXH) containing the computer, the thermal printer FS-PA1 and three games: Galaxian, Hydlide 3 and Snatcher.

Brand Panasonic
Type FS-A1WX
Year 10-1988
RAM 64kB in slot 3-0
VRAM 128kB
Media 720kB 3,5" floppy disk drive
Video Yamaha V9958
Chipset Toshiba T9769 model A or B
Extras Ren-Sha Turbo (autofire), hardware pause key, MSX-MUSIC BASIC, Kanji-ROM level 1 & 2 , firmware (A1 Cockpit, Word Processor, MSX-JE), firmware switch, Z80 compatible CPU built in MSX Engine (T9769x) that can be switched to 3.57MHz or 5.37MHz via I/O ports, Kanji BASIC


By comparison with the version available on the F1S-A1FX, the built-in Cockpit software has been completely revised to integrate the Word Processor, where one of the options requires the first system disk with the MSX-JE input system for the kana-kanji conversion. The options to change the screen colors or adjust the screen have been removed while the disk tool, the graphic tool in SCREEN 8 and the picture gallery in SCREEN 12 are now independent programs on a second system disk.

The firmware program can be skipped by pressing DEL key while booting or by changing the position of the front switch before booting the computer. From MSX-BASIC, you can go to the firmware menu with CALL MENU or _ MENU. When you quit an application of the second system disk, you come on the MSX-DOS command line; by entering TOOL on this command line, you can go back to the menu of this system disk.


Panasonic FS-A1WX
Panasonic FS-A1WX
Panasonic FS-A1WX
Panasonic FS-A1WX PCB
Panasonic FS-A1WX PCB back
Panasonic FS-A1WX FM Chips
Panasonic FS-A1WXH box


The FS-A1WX is a MSX2+ with 2 cartridge slots (one at the top, one at the back) and a Z80A integrated in MSX-Engine T9769(A or B) from Toshiba. This Z80A can be switched from to 3.57MHz to 5.37MHz via I/O ports. There is a front switch to disable the firmware application execution. Firmware can be accessed from BASIC via CALL MENU-command. Floppy Disk Controller chip is the TC8566F.

The features the Rensha Turbo, which is a built-in auto-fire system. The repetition speed can be adjusted with a slider. Its ROM contains A1 Cockpit Internal Software, MSX Word Processor, MSX-JE, FM-BIOS (MSX Music Basic ROM) and Kanji Support (JIS level 1 & 2).

Main RAM can be natively expanded to 256kB internally. (See below)

Floppy Disk Belt specifications:

Type: Rubber Belt
Thickness: 0.3mm
Diameter: 58mm
Width: 3mm

Slot Map

Slot Slot
0-0 0-1 0-2 0-3 Slot 1 Slot 2 3-0 3-1 3-2 3-3
Bank C000h~FFFFh Cartridge
Slot 1
Slot 2
Bank 8000h~BFFFh Kanji
Bank 4000h~7FFFh Main-ROM MSX-Music Disk ROM
Bank 0000h~3FFFh Sub-ROM
  • Slot 3-3 is also divided into 8kB banks. Each can contain internal RAM, ROM or SRAM using the Panasonic_mapper.


CPU Turbo mode

Contrary to Sony and Sanyo MSX2+ systems which run only at 3.57 Mhz, the Panasonic systems are capable of running at 5.37 MHz. In Basic this can be achieved with the following commands:

Activating the 5.37 MHz Mode

Switching to Turbo 5.37 MHz mode can be activated with the following command:

IF PEEK(&H2D)=2 THEN OUT 64,8:IF INP(64)=247 THEN OUT 65,0

Deactivating the 5.37 MHz Mode

Switching back to 3.57 Mhz is done with this command:

IF PEEK(&H2D)=2 THEN OUT 64,8:IF INP(64)=247 THEN OUT 65,1