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G > GEMINI  > GALAXY   


Gemini
GALAXY

The Gemini Galaxy range of computers were of "all British" origin, being manufactured by Gemini Microcomputers Ltd., Amersham, Bucks.

Also called the 'Multiboard Microsystem', the Galaxy systems were built around the 80-BUS, specifically designed for the Z80 microprocessor. They had two Z80A processors, one acting as the CPU and the other running the 'programmable' video card (Called the IVC).

The video card memory was composed of: 2 KB Monitor ROM (SIMON), 2KB User workspace RAM (it was capable of holding user routines), 2 KB Screen RAM, 2KB character generator ROM, 2KB character generator RAM (programmable fonts). Numerous cards were available, like IEEE488 interface card, SASI floppy drive controller or colour graphics card.

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.

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My father, John Marshall, was the founder of NASCOM and then Gemini.

I remember this great lump of a computer very well. We had one at home that I was not allowed to use!

I never really inherited my father''s interest in technology and to me I still find iphones and PCs a thing of mystery and frustration.

I was fascinated to find this article. My father passed away a few years ago now but I think about him all the time. It is lovely being able to read things like this and to realise there are still some of them out there, even if they are in garages or boxes.

          
Wednesday 29th March 2017
Noel Marshall (United Kingdom)

I sold quite a few of those at the time from my shop/workshop in Aarhus.
A brilliant machine that came with all documentation - even schematics for
all the boards in the machine. (I guess I still have the manuals somewhere).
We used to convert them to be used for entry to professional phototypesetters.
The MFB model was equipped with all the types of floppy drives and a program
to analyse and setup all diskette formats. Genious !!

          
Sunday 24th July 2016
Svend Saustrup (Denmark)

I bought a Gemini Galaxy 1 when they first were available, still have though haven''t used for many years. It was £1850 new. I wrote many programs using the language Comal which was one the software packages that came with the machinre. It had twin processors one video, one for the processing Z80a chips were used. Twin 400k floppy 5 1/4 inch drives ment quick loading. Well ahead for it''s time. I added a modem later on which I bought second hand for £40.00 so I could connect to Bulletin Boards sites. The 80 bus was a great inovated system with board sloted in to adapt the computer and CP/M was a good operating system with now blue screens. A light pen system for touch screen opertion was available also a clock board.could give date and time.

          
Monday 6th September 2010
James Harrison (UK)

 

NAME  GALAXY
MANUFACTURER  Gemini
TYPE  Professional Computer
ORIGIN  United Kingdom
YEAR  1983
KEYBOARD  Full stroke keyboard with numeric keypad
CPU  Zilog Z80A
CO-PROCESSOR  second Zilog Z80A running the 'programmable' video card (Called the IVC).
RAM  64 KB dynamic
VRAM  2 KB
ROM  2 KB Phantom Bootstrap ROM
TEXT MODES  80 x 25
GRAPHIC MODES  160 x 75
COLORS  Unknown
I/O PORTS  Centronics, RS232, Light Pen, Tape
BUILT IN MEDIA  Two 5.25'' disk-drives
OS  CP/M 2.2 and MP/M
POWER SUPPLY  Unknown
PRICE  Unknown


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