Category:Sony HB-55
This page was last modified 17:40, 23 April 2019 by Mars2000you. Based on work by Rderooy and Gdx.

Contents

Description

The HB-55 is the first MSX computer released by Sony. It has a low-cost keyboard. The following models exist:

Product Region PSU Keyboard Video and audio out Colour Expansion
Sony HB-55 JP 100V 60Hz QWERTY w/JP ANSI RF, Composite video and audio Red or Gray 1 Cart + 1 Exp
Sony HB-55P Europe  ?V 50Hz QWERTY with £ key RF, Composite V+A DIN Gray 2 Cartridges


From the beginning, Sony wanted to distinguish itself from its competitors, that's why the machine comes with a built-in Personal Databank with saving to cassette tape or the included HBI-55 data cartridge. HB means Hit Bit and there's also a special logo saying 'It's a Sony'.

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

The firmware is launched automatically when you boot the machine. Due to some limitations of the original firmware, there have been two releases of the Japanese machine. The international model is based on the second version of the firmware.

Brand Sony
Type HB-55 / HB-55P
Year 1983 (HB-55 1st version) - 1984 (HB-55 2nd version and HB-55P)
Region HB-55: Japan
HB-55P: Europe
Original price JP: ¥54,800
NL: ƒ899
RAM 16kB in slot 0
VRAM 16kB
Media MSX cartridges
Video Texas Instruments TMS9918ANL (HB-55) or TMS9929A (HB-55P)
Audio PSG (AY-3-8910A or YM2149F)
Chipset none (separate IC's)
Extras Personal Databank, reset button, HBI-55 S-RAM cartridge

Pictures

Check also the pages about the different models!

Sony HB-55 (gray)
Sony HB-55 (gray) back
Sony HB-55 (gray) right side
Sony HB-55P
Sony HB-55P back
Sony HB-55 (red)
Sony HB-55 PCB

Specifications

The HB-55 is a MSX1 with a Z80A from NEC (D780C-1).

Slot Map for HB-55 model

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Front
cartridge
slot
Expansion
Bus
Page 8000h~BFFFh DataBank
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh
  • Note about the firmware (DataBank): first version is a 8kB ROM (8000h-9FFF), second version is a 16kB ROM (8000h-BFFFh).

Slot Map for HB-55P model

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh RAM Front
cartridge
slot
Back
cartridge
slot
Page 8000h~BFFFh DataBank
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh
  • Note about the firmware (DataBank): only the second version was built-in in this model, it is a 16kB ROM (8000h-BFFFh).

Connections

Upgrades

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-55"

The following 2 pages are in this category, out of 2 total.

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