Sony HB-T7
This page was last modified 15:29, 1 May 2023 by Mars2000you. Based on work by Elkif0 and Zeilemaker54 and others.




The Sony HB-T7 is a computer whose external design is based on the HB-F5 but that is internally very different, especially with the addition of a modem.

It was sold as Communication Terminal. It's one of the two computers released by Sony in the communication sector, the other one is the HB-T600.

Brand Sony
Model HB-T7
Year 1987
Region Japan
Launch price ¥59,800
RAM 64kB in slot 3-3 + 8kB SRAM
VRAM 128kB
Media MSX cartridges
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Keyboard layout QWERTY/JP50on + numeric keypad
Extras Telcom firmware, Modem, MSX-Modem BASIC, Kanji-ROM level 1, reset button, switch for telephone line tone / pulse
Emulation partially emulated in blueMSX - ROM dump needed for openMSX. See this thread for details


The included firmware is different from the HB-F5. It is automatically launched when you boot the computer.

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).

From MSX-BASIC, you can go back to the firmware with CALL TELCOM or _TELCOM.



Sony HB-T7 manual
Sony HB-T7 box and content
Sony HB-T7 with cables
Sony HB-T7
Sony HB-T7 motherboard
Sony HB-T7 box
Sony HB-T7 detail of front
Sony HB-T7 label
Sony HB-T7 back
Sony HB-T7 right side


MSX-TELCOM Intro screen
MSX-TELCOM Modem Settings


The HB-T7 is a MSX2 with two cartridge slots, 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).

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 Firmware*
Page 0000h~3FFFh Sub-ROM

(*) The 64kB firmware rom is in slot 3-1, it has a mapper and is composed of 8 blocks of 8kB. It has also 8kB SRAM.