NTT Captain Multi-Station
This page was last modified 15:40, 16 April 2019 by Mars2000you. Based on work by Rderooy and Gdx 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 network and therefore enjoy all its features. CAPTAIN means Character And Pattern Telephone Access Information Network and was the Japanese version of Videotex/BBS.

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, probably only usable on this machine for the Captain Videotex/BBS activities.

The graphic power of the VDP V9938 is enhanced by the 100-pin V99C37-F Video Display Controller (or 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 a few machines without this logo.

Brand NTT (Manufacturer: Takaoka)
Type Captain Multi-Station
Year 1987
Region Japan
Original 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 Controller
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
Extras Captain communication firmware, non-standard modem, Kanji-ROM level 1 & 2, remote controller, joypad, IC memory card slot (Sram disk?)


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) and 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 Modem Switches
NTT Captain Multi-Station joypad and remote controller
NTT Captain Multi-Station IC memory card
NTT Captain Multi-Station keyboard pinout
NTT Captain Multi-Station Mainboard (low part)
NTT Captain Multi-Station Modem board
NTT Captain Multi-Station Mainboard (high part)
NTT Captain Multi-Station cables, remote controller, IC memory card, joypad, batteries


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.

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
  • Two AC power plugs

Note: No Data recorder connector!

External Links