Sony HB-T600
This page was last modified 13:17, 3 February 2023 by Mars2000you. Based on work by Zeilemaker54 and Gdx and others.




The Sony HB-T600 was aimed at the Japanese market and sold to investors as stock trading terminal. It's a MSX2 computer with a specific separate keypad, conceived to make easy and fast data communication.

However, this keypad can be replaced by the classical Sony keyboard from the HB-F500, HB-F700, HB-F900, HB-G900 and even HB-701 machines. It was also possible to buy separately this keyboard under the reference KBD-13.

Brand Sony
Model HB-T600
Year 1987
Region Japan
Launch price ¥135,000
RAM 128kB in slot 3-3 + 8kB SRAM
VRAM 128kB
Media MSX cartridges, 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Keyboard layout specific keypad, can be replaced by a classical Sony keyboard
Extras 720kB 3,5" floppy disk drive, third cartridge slot, reset button, switch for telephone line tone / pulse, firmware, Modem, MSX-Modem BASIC, Kanji-ROM level 1, specific keypad, floppy disk with MSX-DOS 1 and stock trading application
Emulation partially emulated in blueMSX - Dump of ROMs and floppy disk needed for openMSX. See this thread for details


The firmware is in fact a cartridge modem inserted in the internal cartridge slot. The data communication program can be launched with CALL TELCOM or _TELCOM.

It is actually a new version of the firmware included in the HBI-1200 modem, combining MSX-Modem BASIC and a data communication program, that can also be found in the Panasonic FS-CM1 modem and the Panasonic FS-A1FM computer.

The Sony version does not have the specific Panasonic extras (Access to The LINKS network, Documents Management, Automatic Awakening).

Floppy disk

A floppy disk was provided with this computer, it contains



Sony HB-T600
Sony HB-T600 front
Sony HB-T600 back
Sony HB-T600 keypad
Sony HB-T600 inside
Sony HB-T600 disk
(stock trading application)
Sony HB-T600 manuals
Sony HB-T600 main PCB
Sony HB-T600 modem PCB
Sony HB-T600 box and content
Sony HB-T600 label


MSX-TELCOM Intro screen
MSX-TELCOM Modem Settings


Stock Trading - intro screen


The HB-T600 is a MSX2 with three cartridge slots (2 external in front, 1 internal with the Sony HBI-1200 modem), a Z80A from Sharp (LH0080A) and an MSX-Engine S1985 from Yamaha. The modem speed is 300/1200bps and has automatic features (dial and log in). The specific keypad can be replaced by a classical keyboard.

Slot Map

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

Note: The firmware rom (64kB) is in slot 3-1 between 4000h and 7FFFh, it has a mapper of 8 blocks of 8kB similar to that of MSX-DOS 2 and 8kB SRAM. The modem card can be replaced by an FM-PAC or other cartridge that does not extend the slot.


  • 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, Mouse, Paddle controllers, etc)
  • 3 cartridge slots (2 external, 1 internal)

Note: No Data recorder connector!