Category:Sony HB-75
This page was last modified 22:01, 18 March 2018 by Rderooy. Based on work by Gdx and Grauw and others.



The HB-75 is the big brother of the HB-55 as it comes with more RAM and a better keyboard. The following models exist:

Product Region Keyboard Video and audio out Colour Expansion
Sony HB-75 JP QWERTY w/JP ANSI RF, Composite video and audio Black or White 1 Cart + 1 Exp
Sony HB-75AS AU QWERTY with £ key RF, RGB SCART, Composite V+A DIN Black 2 Cartridges
Sony HB-75B UK QWERTY with £ key RF, RGB SCART, Composite V+A DIN Black 2 Cartridges
Sony HB-75D DE QWERTZ RF, RGB SCART, Composite V+A DIN Black 2 Cartridges
Sony HB-75F FR AZERTY RGB SCART Black 2 Cartridges
Sony HB-75P Europe QWERTY with £ key RF, RGB SCART, Composite V+A DIN Black 2 Cartridges

The machine comes with a built-in Personal Databank with saving on cassette tape or the included HBI-55 data cartridge.

The Japanese model has only one cartridge slot, but an expansion bus can be used as second cartridge slot. On the international versions, the expansion bus slot is replaced by a second cartridge slot.

The firmware is launched automatically when you boot the machine.

Brand Sony
Type HB-75 / HB-75AS / HB-75B / HB-75D / HB-75F / HB-75P
Year 1984
RAM 64kB in slot 2
Media MSX cartridges
Video Texas Instruments TMS9918ANL (HB-75) or TMS9929A (other models)
Audio PSG (AY-3-8910A or YM2149F)
Chipset none (separate IC's)
Extras Personal Databank, reset button, HBI-55 S-RAM data cartridge


Check also the pages about the different models!

Sony HB-75 (white)
Sony HB-75F
Sony HB-75 (black)
Sony HB-75P
Sony HB-75D
Sony HB-75 all models right side
Sony HB-75 (white) back
Sony HB-75AS/B/D/P back
Sony HB-75P inside
Sony HB-75F back


The HB-75 is a MSX1 with a Z80A from NEC (D780C-1). Its RAM is in slot 2.

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3
Bank C000h~FFFFh Cartridge
Slot 1
Slot 2
Bank 8000h~BFFFh DataBank
Bank 4000h~7FFFh Main-ROM
Bank 0000h~3FFFh


  • RF output (on all models except HB-75F)
  • Analog sound output (mono) and composite output (only HB-75)
  • Monitor connector with sound and composite video outputs (6-pin DIN) on HB-75AS, HB-75B, HB-75D and HB-75P
  • RGB output (SCART) on HB-75AS, HB-75B, HB-75D, HB-75F and HB-75P
  • Data Recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mouse, Paddle controllers, etc)
  • 1 cartridge slot (HB-75) or 2 cartridge slots (other models)
  • 1 Expansion bus slot with one polarizing key (only HB-75)
  • Power plug for main power supply


Adding a disk drive to this system has the effect that the firmware menu (Personal Data Bank) is skipped on startup. If both a disk drive and S-RAM cartridge, such as the HBI-55 is present the menu is not skipped, but the disk drive is disabled. No workaround is available for this.

External links

Pages in category "Sony HB-75"

The following 6 pages are in this category, out of 6 total.