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S > SONY  > Hit-Bit 55   

Hit-Bit 55

The Hit-Bit 55 was a classic MSX1 computer. It was very similar to the Hit-Bit 75. Its most distinctive sign was its flat but good quality keyboard. It was one of the few MSX with the Philips VG-8000 to have a low-cost keyboard.

Unlike the HB-75, it had only 16 KB RAM. There was a built-in software (scheduler and memo) which was a kind of cut-down version of the one built-in the HB-75, program size was only 8 KB against 16 KB on the HB-75, it seems that some version had the 16 KB version though. To save files made with this apps, a 4K S-RAM non-volatile cartridge was used (called HBI-55).

The Hit-Bit 55 was clearly marketed as the low-range MSX model of the Hit-Bit serie. It was also available in a red and black cases.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).$zsjTpFR0oYQ

please help we have zx spectrum 48k and one 128k program running at 6mhz using external ram and snapper discs from velesoft site

Saturday 6th April 2013
Roger Jowett (Ulster Londonderry)
sam coupe

My first computer... I love It!

Tuesday 17th January 2012

My first computer... I love It!

Tuesday 17th January 2012


NAME  Hit-Bit 55
TYPE  Home Computer
YEAR  1984
BUILT IN LANGUAGE  Microsoft Extended Basic (MSX Basic V1.0) + Agenda software
KEYBOARD  Calculator keyboard. 75 keys, including 5 function keys, cursor keys, HOME, STOP, INS, DEL, RESET, BS, SELECT, CODE, GRAPH, CAP, SHIFT (x2), TAB, CTRL, RETURN, ESC
CPU  Zilog Z80A
SPEED  3.58 MHz
CO-PROCESSOR  Video chip compatible with the Texas Instruments TMS 9918/A or TMS 9928/A (Japan : 60 Hz) or TMS 9929/A (Europe : 50 Hz)
RAM  16 KB
ROM  32 KB BASIC/BIOS ( MSX BASIC V1.0) + 8 KB/16 KB (built-in software)
TEXT MODES  Mode 0 : 40 x 24
Mode 1 : 32 x 24
GRAPHIC MODES  Mode 2 : 256 x 192 with 16 colors (Hires mode)
Mode 3 : 64 x 48 with 16 colors (Multi colour mode)
32 sprites
SOUND  General Instruments AY-3-8910 Programmable Sound Generator
3 channels, 8 octaves
I/O PORTS  2 joystick sockets, 2 cardridge slots, Tape-recorder plug (1200/2400 bauds), RGB video output (or composite video + sound output), Centronics interface
POWER SUPPLY  Built-in power supply unit
PRICE  55,800 yen (Japan, 1984)

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