NTT Captain Multi-Station
This page was last modified 14:00, 7 December 2021 by Mars2000you. Based on work by Gdx and Msxholder and others.




The Captain Multi-Station (CMS) is a very special MSX2 computer, aimed at the Japanese market, as it required a password to connect to the Captain system and therefore enjoy all its features.

This machine does not have cassette ports or disk drives, but comes with an uncommon RAM size (192kB), an uncommon VRAM size (256kB), a non-standard modem, a remote controller and an IC memory card with a capacity of 125696 bytes.

The graphic power of the VDP V9938 is enhanced by the 100-pin V99C37-F Video Display Co-Processor, that is able to display a palette of 256 colors selected amongst 260000 different colors. It is also known as VCP or Video Control Palette. The VDC/VCP chip is connected to the VDP external bus. This combination makes easy videotext with Japanese characters. According some rare sources, the Yamaha YM6011-F would be the same chip.

The keyboard has the KPC (Kobe Port Captain) logo, it was also used for the Daisen Sangyo MX-2021 computer. Besides, it has the same design as the black keyboard of the Hitachi MB-H50.

Note: most NTT Captain Multi-Station computers have the MSX2 logo in front, but there are machines that have lost this logo. It is a sticker!

Brand NTT (Manufacturer: Takaoka Electric)
Model Captain Multi-Station
Year 1987
Region Japan
Launch price ¥96,000
RAM 192kB in slot 3-3, expandable to 256kB
VRAM 256kB
Media MSX cartridges, IC memory cards
Video Yamaha V9938 + V99C37-F Video Display Co-Processor
Audio PSG (YM2149 integrated in MSX-Engine S1985), Captain tones produced by a Yamaha MSX-MUSIC chip (YM2143) without FM-BIOS rom (CALL MUSIC does not work)
Chipset Yamaha S1985
Keyboard layout QWERTY/JIS
Extras IC memory card slot (Sram disk?), Kanji-ROM level 1 & 2, non-standard modem, remote controller, joypad, Captain communication firmware
Emulation ROM dump needed. See this thread for details


When booting the machine, the menu of the firmware displays 4 options:

  • Unlock code (access to Captain network)
  • IC memory key (operations with IC memory card)
  • MSX (launching of the MSX2 computer)
  • Memorize key (registration, setup, deletion)

To use this machine as a 'normal' MSX2 computer, you need to select the third option. So, you must press *, M, S, X and # on the remote controller to use it as a MSX2.



NTT Captain Multi-Station
NTT Captain Multi-Station
Yamaha V99C37-F video co-processor
NTT Captain Multi-Station front
NTT Captain Multi-Station back
NTT Captain Multi-Station joypad and remote controller
NTT Captain Multi-Station IC memory card
NTT Captain Multi-Station cables, remote controller, IC memory card, joypad, batteries
NTT Captain Multi-Station Mainboard (low part)
NTT Captain Multi-Station Modem board
NTT Captain Multi-Station Mainboard (high part)
NTT Captain Multi-Station Modem switches
NTT Captain Multi-Station label


NTT CMS - Firmware menu
NTT CMS - IC memory card screen


The NTT CMS is a MSX2 with a Z80A from Sharp (LH0080A) and a MSX-Engine from Yamaha (S1985). The modem is non-standard: its speed is 75/4800bps and CALL COMINI does not work. Besides the classical keyboard, a remote controller can also be used and is even required for access to the 'pure' MSX part of this machine.

The Video Display Processor is a V9938 enhanced with the Yamaha V99C37-F Video Display Co-Processor and 128kB of additional VRAM to be compatible with the Captain system.

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
Page 4000h~7FFFh Main-ROM Firmware
Page 0000h~3FFFh Sub-ROM


  • VHF antenna connector
  • VHF TV connector
  • RGB output
  • Analog sound & Composite video
  • Keyboard connector
  • Two RJ11 modular connectors for modem (line in and telephone out)
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mice, Paddle controllers, etc)
  • 2 cartridge slots
  • IC memory card slot
  • Power plug for main power supply (JIS C 8303 class, AC 100V +/-10% 50/60Hz)
  • 2 power outlet for monitor and another device (AC 100V)

Note: No Data recorder connector!

External Links