National FS-4000
This page was last modified 22:38, 21 April 2019 by Mars2000you. Based on work by Rderooy and Gdx.




The National FS-4000 is a "Word-pro Persocom" (Word processor Personal Computer) with a built-in 24 dots thermal transfer printer. The FS-4000 was available in full black or in black and white. It is the last MSX1 computer released by National and was aimed at the Japanese market.

This computer comes with a built-in Japanese/English Word Processor with kana-kanji conversion, however the procedure is not compatible with MSX-JE.

This firmware is automatically launched when you boot the machine, there is no way to bypass it. Two switches at the back allow to change the print density and select an external printer instead of the built-in printer. On emulators, these switches are not yet emulated.

The original replacement ink cartridge is the CF-PR120.

Brand National
Type FS-4000
Year 1985
Region Japan
Original price ¥106,000
RAM 64kB in slot 3-2, 2kB SRAM
Media MSX Cartridges
Video Texas Instruments TMS9128
Audio PSG (YM2149 integrated in MSX-Engine S3527)
Chipset Yamaha S3527
Extras built-in printer, switch for selecting print density, switch for selecting an external printer, Kanji-ROM level 1, firmware: Japanese + English Word Processor, specific compound Kanji dictionary (not MSX-JE), kanji driver


The firmware menu presents 3 options:

  1. Japanese Word Processor (15 characters per line)
  2. English Word Processor (30 characters per line)

Each Word Processor has a menu with 5 options: 1 - New text - 2 - Edit text - 3 - Print - 4 - Save - 5 - Load. In options 1 and 2, you can access the settings with F8.

Only 2 paper sizes are available for the printer: A4 and B5. Saving of text and settings can only be done to tape.

The Kanji dictionary is very rudimentary. To get a better kana-kanji conversion, it's recommended to use the FS-SR022 Kanji Dictionary Tool cartridge with the FS-4000 computer.

From MSX-BASIC, you can go back to the word processors with CALL JWP or _JWP for the Japanese Word Processor and CALL EWP or _EWP for the English Word Processor.



National FS-4000 (black and white)
National FS-4000 back connectors
National FS-4000 right side
National FS-4000 manuals (+ National CF-2500 RF adapter, cables and Panasonic FS-JS220 joypad)
National FS-4000 inside
National FS-4000 PCB
National FS-4000 (black)
National FS-4000 box


National FS-4000 Main menu
National FS-4000 Japanese Word Processor menu
National FS-4000 Japanese Word Processor option 3 of menu
National FS-4000 Japanese Word Processor option 4 of menu
National FS-4000 English Word Processor settings
National FS-4000 English Word Processor option 3 of menu


The National FS-4000 is a MSX1 with 2 cartridge slots (in parallel one at the top). The CPU is a Z80 from NEC (D780C-1). There is also a co-processor (NEC D7807G) with 2kB of (S)RAM for the printer handling. The MSX-Engine comes from Yamaha (S3527).

Slot Map

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



As designed, the built-in word processor cannot save to disk. In fact adding a disk drive has the effect that the built-in software is skipped, making the integrated word processor inaccessible. No work around is available other then booting while keeping the SHIFT key pressed to disable the disk drive.