National FS-4600F
This page was last modified 13:36, 24 May 2023 by Mars2000you. Based on work by Gdx and Rderooy.




The National FS-4600F is a "Word-pro Persocom" (Word processor Personal Computer) with a built-in 24 dots thermal transfer printer and a double-sided disk drive.

The FS-4600F was available only in dark silver. It was aimed at the Japanese market.

A special edition was released by the Com Intex (= Computer Communication Inter Exchange) company in a monstruous educational box containing the computer and 20 floppy disks with 85 lessons (was also sold in a set with the MSX2 Sanyo MPC-25FS, Sanyo PHC-77 and the MSX2+ Panasonic FS-A1WX).

Firmware data can be saved on the FS-CR1008S cartridge. It contains 8kB SRAM and a battery to preserve them when the computer is off.

A dial on the left side allows a change of print density. With the dial set to the maximum, it is possible to print directly onto thermal paper. This way no ink cartridge is needed.

A switch at the back allows a selection between external printer or built-in printer. Dip switches allow selection between JP50on or JIS keyboard layout, modification of paper feed pitch and to bypass the firmware menu and go directly to BASIC on startup. On emulators, these switches are not yet emulated, so you can't bypass the firmware when booting the computer.

The original replacement ink cartridge is the CF-PR120, but you can also use the CF-PR110.

Brand National
Model FS-4600F
Year 1986
Region Japan
Launch price ¥138,000
RAM 128kB in slot 3-2, 8kB SRAM for software data back up
VRAM 128kB
Media MSX cartridges, 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Keyboard layout QWERTY/JIS by default (JP50on available with dip switch) + numeric keypad
Extras 720kB 3,5" floppy disk drive, reset button, built-in printer, dial for selecting print density, switch for selecting an external printer, dip switches for keyboard mode setting, paper feed pitch and firmware enable/disable, Kanji-ROM level 1, 12x12 Dot Kanji-ROM, MSX-DOS 1 + Image Converter (on disk), firmware: Japanese + English Word Processor, MSX-JE (compound Kanji dictionary), kanji driver, Address Book & Business Card
Emulation ROMs dumped and emulated with exception of the internal printer. The printer select switch is set to External printer and cannot be changed. The firmware application menu switch is enabled by default and cannot be changed. Keyboard switch is set to JIS and cannot be changed.


This computer comes with a built-in Japanese/English Word Processor with MSX-JE kana-kanji conversion.

The firmware menu presents 4 options:

  1. Japanese Word Processor (15 or 30 characters per line)
  2. English Word Processor (30 or 60 characters per line)
  3. Address Book & Business Card

Each Word Processor has a sub-menu with 7 options: 1 - New text - 2 - Edit text - 3 - Print - 4 - Save - 5 - Load 6 - Delete (only on disk) - 7 - Close. In options 1 and 2, you can access settings with F8.

Compared to the FS-4500 or FS-4700 firmware, the Address Book & Business Card utility has remained unchanged and there are a few changes in the Word Processors:

  • The most important change is that MSX-JE procedure is used for the kana-kanji conversion
  • The program has support for 12x12 kanjis
  • A 6th paper size is available
  • Two new parameters have been added in the print option
  • The loading is faster
  • Closing a Word Processor does not automatically lead to reset, you need to manually reset the computer

From MSX-BASIC, it's no more possible to go back to the firmware applications with CALL instructions.

Note: National also released a add-on cartridge, the FS-SR023 which allows the built-in word processor to print a 48 dot "Brush" style typeface.


Besides MSX-DOS 1, the provided floppy disk contains a simple drawing program in screen 7, named "Image Converter", with keyboard and mouse support. Several pictures are included and the last icon is for using the FS-RS500 scanner, with choice between two scanning modes.

To run MSX-DOS, you need to insert the disk in drive A and choose option 4 of the firmware menu. On a real machine, you can also skip the firmware menu by using the dip switches before booting with the MSX-DOS disk in drive A. In both cases, you need to press CTRL+STOP to avoid the launching of the drawing program.



National FS-4600F box
National FS-4600F
FS-4600F manuals, disk and cables
National FS-4600F keyboard
National FS-4600F back + underside
National FS-4600F right side
National FS-4600F back (close-up)
National FS-4600F mainboard
National FS-4600F annex board
National FS-4600F box and content
Com Intex box opened
National FS-4600F close-up
National FS-4600F - Com Intex box
FS-4600F + Com Intex disks
National FS-4600F label


National FS-4600F Main menu
National FS-4600F Japanese Word Processor sub-menu
National FS-4600F Japanese Word Processor option 3 of sub-menu
National FS-4600F English Word Processor settings
National FS-4600F English Word Processor option 3 of sub-menu
National FS-4600F Japanese Word Processor option 4 of sub-menu
National FS-4600F Address Book & Business Card
National FS-4600F Address Book & Business Card
National FS-4600F Address Book & Business Card


National FS-4600F Image Converter
National FS-4600F Image Converter
National FS-4600F Image Converter


The National FS-4600F is a MSX2 with 2 cartridge slots (in parallel one at the top). The CPU is a Z80 from Zilog (Z084C0004PSC). The MSX-Engine comes from Yamaha (S1985). The SRAM is a NEC D4464C-15L chip on the annex board. The floppy disk controller is the MB8877A from Fujitsu Microelectronics.

Slot Map

Slot Slot
0-0 0-1 0-2 0-3 Slot 1 Slot 2 3-0 3-1 3-2 3-3
Page C000h~FFFFh Cartridge
Slot 1
Slot 2
Page 8000h~BFFFh Kanji driver
Page 4000h~7FFFh Main-ROM Disk ROM
Page 0000h~3FFFh Sub-ROM Word-Pro
Font 1
Font 2


External links