My Gemini Stuff

Disclaimer

This page has nothing to do with the Illinois based American company, Gemini Computer Systems, nor the Google AI product.

Introduction

The Gemini computers were made by Gemini Microcomputers Ltd., later Gemini Computer Systems of Great Britain, in the early to mid 80s. Their early models were built around the Zilog Z80A processor, but one model - the Gemini Challenger was based on Motorola's 68020 processor. The company was started by John A. Marshall, who previously headed Nasco Sales Ltd, famous for the Nascom computer line. The Nascom and Gemini computers are supposedly compatible to some extent.

I have been fortunate enough to inherit a collection of Gemini computers and peripherals.

Computer Emulation

• John Hanson's XBeaver Nascom and Gemoni 80-bus emulator.

Media Emulation

• David Gesswein's MFM drive reader/emulator (successful test reported!)
• Decromancer's improved MFM drive reader/emulator (based on the above)
• The DREM MFM/RLL Drive Emulator
• FlashFloppy firmware for the Gotek USB Floppy Emulator

Other resources

• John Newcombe's pages:
  • John Newcombe's Github repository - contains documentation and files.
  • The Gemini section of John's website.
• The Nascom Computer User Group mailinglist on Groups.io.
• Pages at The CEntre for Computing History:
  • Gemini Galaxy 1
  • Enigma (Gemini Galaxy)
• WikiPedia pages:
  • Gemini Challenger
• Pages at nosher.net:
  • Gemini Micro Advert - November 1982