The Gemini Galaxy range of computers were of "all British" origin, being manufactured by Gemini Microcomputers Ltd., Amersham, Bucks.
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.
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
I/O PORTS Centronics, RS232, Light Pen, Tape
BUILT IN MEDIA Two 5.25'' disk-drives
OS CP/M 2.2 and MP/M
Thanks to www.old-computers.com for the specification
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This exhibit has a reference ID of CH11357. Please quote this reference ID in any communication with the Centre for Computing History.
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