National CF-3300
This page was last modified 16:20, 3 November 2021 by Mars2000you. Based on work by Bodhi1969 and Gdx and others.




The CF-3300 is a home computer produced by the Japanese corporation Matsushita Denki and released in early summer 1985 in Japan.

It has the same look as the CF-3000 as it consists out of a single case with a separate keyboard with numeric keypad. Like its brother, this model is available in silver color.

However, it has a built-in disk drive and a special connector allows to add an external second disk drive. It was also the first computer to ship with MSX-DOS 1.

The MSX1 product line from National was called "King-Kong".

Brand National
Model CF-3300
Year 1985
Region Japan
Launch price ¥148,800
RAM 64KB in slot 3-0
Media MSX Cartridges, 3.5" 2DD floppy disks
Video Texas Instruments TMS9928A
Audio PSG
Chipset none (separate IC's)
Keyboard layout QWERTY/JP50on + numeric keypad
Extras Eject button for each cartridge port, superimpose connector, numeric keypad, reset button, connector for external second floppy disk drive, floppy disk with MSX-DOS 1 + additional software
Emulation ROMs dumped and emulated


A floppy disk is provided with this computer. It includes MSX-DOS 1 and some other programs.

The software menu has 5 options:

  • 1 - Space Shuttle demo in MSX-BASIC with PSG effects and music
  • 2 - Art 32 (graphic editor in MSX-BASIC - a touchpad is required)
  • 3 - MSX Baseball game
  • 4 - Home Calc (spreadsheet)
  • 5 - Disk BASIC

To run MSX-DOS, you need to choose option 5 and enter CALL SYSTEM - You can also boot the computer while pressing CTRL+STOP to access directly the MSX-DOS command line, but in this case, the second (logical or physical) drive will be disabled.

Note: The provided floppy disk is 1DD (360kB), but the drive of the CF-3300 computer supports also 2DD floppy disks (720kB).



National CF-3300
CF-3300 floppy disk
National CF-3300 label
National CF-3300
National CF-3300 manuals
National CF-3300 back
National CF-3300 main PCB
CF-3300 drive controller PCB
National CF-3300 drive
National CF-3000/3300 keyboard


CF-3300 software - menu
CF-3300 software - demo
CF-3300 software - Art 32 menu 1
CF-3300 software - Art 32 menu 2
CF-3300 software - MSX Baseball
CF-3300 software - Home Calc


The CF-3000 is a MSX1 with a Z80A from NEC (D780C-1) and without MSX-Engine. The floppy disk controller is the MB8877A from Fujitsu Microelectronics.

The superimpose unit (CF-2601) is optional.

  • Size: 428×96×285 mm (unit), 426×40×159 mm (keyboard)
  • Weight: 6.8kg

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
64kB RAM
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM Disk ROM
Page 0000h~3FFFh