Sony HB-11
This page was last modified 01:15, 25 November 2022 by Gdx. Based on work by Mars2000you and Oedov Oedidle and others.
Sony HB-11 blue




The Sony HB-11 is the last MSX1 computer released by Sony, aimed at the Japanese market. It is called "HitBit U" (U for University?) and is dedicated to students.

The case color is available in red or deep blue. The power supply is buit-in.

The design is intermediate between the HB-201 and the HB-10, as only the pause button and the carrying handle have been removed.

A retractable stick is build in the middle of the cursor keys, which can be used as joystick. As on the HB-501, the back of the case has a location to store the stick during transport.

The HB-11 is one of the rare MSX1 computers having a Kanji-ROM Level 1 (JIS1). It is even mentioned on the box.

Brand Sony
Model HB-11
Year 1986-02-21
Region Japan
Launch price ¥48,000
RAM 64kB (in slot 3-2)
Media Cartridges
Video Texas Instruments TMS9118NL
Audio PSG (YM2149 integrated in MSX-Engine)
Chipset Yamaha S3527
Keyboard layout QWERTY/JP50on
Extras reset button, built-in joystick, Kanji-ROM level 1, firmware: Word Land Sentence II (Japanese Word Processor) + English-Japanese Dictionary - tape with examples
Emulation ROMs dumped and emulated


The Personal Databank of many Sony MSX1 computers has been replaced by a firmware with 2 applications and a global menu:

  • an English-Japanese Dictionary created by the Stratford Computer Center Corporation
  • a Japanese Word Processor: Word Land Sentence II with kanji conversion dictionary of 3900 words (was also sold separately as cartridge)

The firmware is launched automatically when you boot the machine.

The menu presents 3 options:

  • English-Japanese Dictionary
  • Word Processor

From MSX-BASIC, you can start this firmware with CALL HITBIT or _HITBIT.

The firmware includes an easter egg (S+P or Y+P during boot), a hidden text "A Yellow Panther Production MCMLXXXV", and 7 alternative MSX-BASIC fonts you can choose with CALL FONT (n).


A tape is provided in addition to this firmware, it contains 50 examples of sentences.



Sony HB-11 red
Sony HB-11 box
Sony HB-11 box back
Sony HB-11 blue
Sony HB-11 label
Sony HB-11 stick slot
Sony HB-11 box and content
Sony HB-11 PCB
Sony HB-11 PCB (underside)
Sony HB-11 red back
Sony HB-11 blue back


Sony HB-11 firmware menu
Sony HB-11 firmware Japanese Wordprocessor


The HB-11 is a MSX1 with a Z80A from NEC (DA780C-1), an MSX-Engine from Yamaha (S3527) and two cartridge slots at the top of the computer.

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 Firmware Firmware Firmware
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh
  • The firmware is a 96kB ROM in the 128kB chip used by Sony for the Main-ROM and the firmware. It can be divided in 3 parts of 32kB: one for the EN-JP dictionary (? slot 3-0), one for the WP (? slot 3-1) and one probably for the menu (? slot 3-3).