National FS-4500
This page was last modified 11:04, 20 March 2022 by Gdx. Based on work by Mars2000you and Rderooy.




The National FS-4500 is a "Word-pro Persocom" (Word processor Personal Computer) with a built-in 24 dots thermal transfer printer. The FS-4500 was available in full black or in black and white. It was aimed at the Japanese market.

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.

Three switches on the back allow a selection between JP50on or JIS keyboard layout, external printer or built-in printer 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-4500
Year 1986-03
Region Japan
Launch price ¥108,000
RAM 64kB in slot 3-2, 8kB SRAM for software data back up
VRAM 128kB
Media MSX Cartridges
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S3527)
Chipset Yamaha S3527
Keyboard layout QWERTY/JP50on by default (JIS available with switch) + numeric keypad
Extras Reset button, built-in printer, dial for selecting print density, switch for choosing keyboard layout, switch for selecting an external printer, switch for enabling/disabling the firmware, Kanji-ROM level 1, firmware: Japanese + English Word Processor, specific compound Kanji dictionary (not MSX-JE), 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 kana-kanji conversion, however the procedure is not compatible with MSX-JE.

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 and Reset. In options 1 and 2, you can access settings with F8.

Compared to the FS-4000 firmware, there are many improvements:

  • 5 options instead of 2 for paper sizes for the printer, including B4
  • Default device for saving of text and settings is automatically chosen by the computer: a disk drive if present, or otherwise tape.
  • If both devices are available, you can toggle between them with the "-" (minus) key
  • Better kana-kanji conversion as the Kanji Dictionary Tool corresponding to the FS-SR022 cartridge is integrated into the FS-4500
  • Use of screen 7 instead of screen 2 for the Word Processors, which allows more characters per line (30 or 60 by default), but you can use the "-" (minus) key on the main menu to go back to the 'MSX1' setting (15 or 30 characters per line); pressing the "+" key restores the 'MSX2' default setting
  • Addition of 2 extra options in the menu of the Word Processors
  • Addition of the Address Book & Business Card utility, which uses screen 6

From MSX-BASIC, you can go back to the applications with

  • CALL JWP or _JWP for the Japanese Word Processor 'MSX2' setting
  • CALL JWP1 or _JWP1 for the Japanese Word Processor 'MSX1' setting
  • CALL EWP or _EWP for the English Word Processor 'MSX2' setting
  • CALL EWP1 or _EWP1 for the English Word Processor 'MSX1' setting
  • CALL JUSHO or _JUSHO for the Address Book & Business Card utility



National FS-4500 (box and content)
National FS-4500 (black)
National FS-4500 (black/white)
National FS-4500 left side
National FS-4500 right side
National FS-4500 box
National FS-4500 manuals
National FS-4500 back
National FS-4500 label


National FS-4500/4700 Main menu
National FS-4500/4700 Japanese Word Processor sub-menu
National FS-4500/4700 Japanese Word Processor option 3 of sub-menu
National FS-4500/4700 English Word Processor settings
National FS-4500/4700 English Word Processor option 3 of sub-menu
National FS-4500 + diskdrive/4700 Japanese Word Processor option 4 of sub-menu
National FS-4500/4700 Address Book & Business Card
National FS-4500/4700 Address Book & Business Card
National FS-4500/4700 Address Book & Business Card


The National FS-4500 is a MSX2 with 2 cartridge slots (aligned one at the top). The CPU is a Z80 from Zilog (Z084C0004PSC). The MSX-Engine comes from Yamaha (S3527). The SRAM is a NEC D4364C-15L chip.

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
driver 1
driver 2
Page 8000h~BFFFh Bunsetsu
Word-Pro 1
Word-Pro 2
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh Sub-ROM Word-Pro Font


External links