I’ve been working on this site and the following changes have been made:
5th March 2020
- IEEE488 Interface board added
2nd March 2021
- Many small changes, hoping to sort the menu system out
- Photos added to Nascom Power Supplies section
23rd February 2021
- A lot more information added for the MAP-80 RAM card
- Minor update to Other Stuff
- MAP-80 VFC (video & floppy controller) added
- MAP-80 MPI (multi-purpose interface) added
- MAP-80 CPU added.
- New Catalogues page added, with three Gemini catalogues.
- Circuit diagrams added for Nascom AVC card.
- Hardware manual & circuit diagram added for Nascom FDC card.
- Hardware manual added for Nascom I/O card.
- Manuals & circuit diagram added for Nascom RAM card.
- Manuals & circuit diagram added for Nascom RAM(B) card.
11th July 2020
- Minor updates to the GM886 page.
- A couple of updates to the Gemini numbers list.
10th July 2020
- GM886 High Performance 80286 board added. Does anyone have any information on this?
30th June 2020
- GM832 (SVC) drawing link fixed. Now available in full size.
29th June 2020
- More info on the GM860 EPROM programmer. Does anyone have the manual and software for this? Any formats would be fine.
11th June 2020
- History page jazzed up with some clippings. WW info also added.
- WW info added to System-80 page.
- Minor tweaks to GM821 and GM827 keyboard pages.
- GM923 added to Gemini numbers list.
10th June 2020
- Advert for System-80 added.
9th June 2020
Just a comment. Although I’ve used material (photos etc.) from other sources I’ve generally done so with permission – even if I haven’t credited such in every case. I’m not in the business of “asset stripping” other sites either, so I’ve always attempted to take only a small amount from each site. However, there is a very small amount of information available in some cases – particularly on Gemini systems –Β and I particularly want to bring a lot of it into one place where it can be easily found. Consequently you’ll find stuff here that has been taken from elsewhere and I make no apology about that. You’ll also find original photos that I’ve taken and documents that I’ve scanned myself or that have been graciously donated by others. – Mick
- Added some info on the cancelled System-80 system
- Changes to the History of Nascom & Gemini
- Changes to the Nascom-3 section
- Changes to the Lucas disk system page
- New page added for NAS-DOS
- “Smart 1” board advert added to Other Stuff
7th June 2020
- NAS-DOS added to Nascom Disk Systems
- Lucas floppy disk controller added to Nascom Disk Systems
- Lucas floppy disk systems added Nascom Disk Systems
- More info on the Animation Graphics board
4th June 2020
- More updates to the Definitive Gemini Numbers List
- Nascom-3 page re-written with *NEW* photos! π
3rd June 2020
- More info added for the “GM836 Multinet” board.
- Definitive Gemini Numbers list added.
2nd June 2020
- Info added to “The Magazines” including cover scans. This has involved several new pages and quite a lot of new pictures!
- A little tweaking of the Gemini keyboards info.
20th May 2020
- General “tweaking” of all the Nascom monitor pages.
16th May 2020
- More info added to PolyDos page regarding different versions.
15th May 2020
- Info on SIMON and BIOS compatibility added to Gemini Disk Systems.
- Specification & Price List added to Pluto Graphics board (1982).
- More info added to Pluto Graphics board (1986). Pluto 1A?
5th May 2020
- More info on PolyDos.
- Minor updates to Disk Systems in Gemini section.
- Update to CP/M section.
- Library tidied up to make it easier to navigate & maintain.
4th May 2020
- New info on Henelec/G805 disk controller added.
- G809 FDC page edited.
- Starting to include some Polydos info.
3rd May 2020
- G682 bus system entry expanded.
- A note on CP/M added to the Gemini Software section.
- A new section on Disk Systems added for the Gemini system.
- Some updates to the Cased Versions section.
- “A Note on keyboards” had GM812 instead of GM821. GM812 is the IVC card.
- Disk Systems in Nascom section updated. Links from pics fixed.
- RP/M section now includes info on version 2.3
29th April 2020
- A little more info on the Henelec / G805 disk system.
- More info on the British Micro Mimi computers.
- Download page added, with drawings for Nascom 2.
15 July 2018
- A little more info on the G801 Mimi.
- GM853 “Bytewide” updated.
- GM863 Battery-backed static RAM added.
- More info on G802 64k dynamic RAM.
- Does anyone know what GM861 was?
13 July 2018
- More info on GM827 keyboard.
- Gemini Galaxy 1 advert added to Publicity page.
4 July 2018
- Changes to A Note on Keyboards.
- Changes to GM827 keyboard page.
28 June 2018
- A Note on Keyboards added to Gemini section.
- G801 Mimi computer added.
- Nascom AVC card added.
27 June 2018
- Slight changes to GM827 & GM852 keyboard pages.
25 June 2018
- More pictures of the Kenilworth case.
- Imp Printer added.
- Minor changes to Notes on Video Systems.
- Much more info on GM836 network card.
- A little more info on the IVC and SVC cards.
- Starting to get my head around Gemini’s pre-built systems…..Β π¦
24 June 2018
- Slightly more detail on the SVC card. It DOES support a serial keyboard!
- More information on NASBUS.
- A couple of pictures added to “History”.
- Kenilworth Case added.
21 June 2018
- GM852 keyboard added. – Looking for more info!
- Slightly more info on GM812 keyboard.
- More info on GM827 keyboard. – Looking for more info!
- More info on GM853 “Bytewide” card.
18 June 2018
- GM812 keyboard info updated.
- New photo for GM803 and manual added.
- More info on G802 64k DRAM added, including new pics, manual & circuit.
- * G806 ‘Supermum’ board added.
- More photos, manuals etc. added for G809 FDC.
- Hardware Manual for G811 Z80 card added to page.
- Added more links to manuals on the Library page.
- * GM827 87-key keyboard added.
- Added a couple of notes to History re G/GM part numbers.
- Text changes to G811 info.
- Quite a few changes on GM813 page.
- Corrections to IVC. IVC & SVC do not support serial keyboards.
- Updates & corrections to G832 SVC.
- * GM815 floppy disk system added.
- A little more info added for GM824 A-D card.
4 June 2018
- Minor text changes to About page.
- Publicity section added.
- Buffer board photo changed as original was small & unclear. This one is still rather unclear but bigger.Β π
27 May 2018
- Added circuit diagram of GM860 EPROM programmer. (Thanks Daniel)
21 May 2018
- Added some info on a ready-built Gemini system. (Thanks Daniel for all of these!)
- Added GM849A disk controller to GM849 page.
- Added GM824 A-D converter board.
- Added GM853 Bytewide board.
- A little more info added to GM808 EPROM programmer.
- GM862 256k RAM added.
- GM880 Z180 processor board added (this is a real gem!)
- Pluto graphics card (1986) added.
- Prototype static RAM disk added.
- Added IO828 Pluto card & manuals (Thanks to Richard at 80-bus.com)
10 November 2017
- Info on G811 Processor board corrected updated.
- Added some detail of the SIMON boot EPROM. (Updated 11/11/17 and 12/11/17)
3 November 2017
- Added more info on NASBUS & 80-BUS
31 October 2017
- Added GM832 SVC hardware manual. (Thanks Steve!)
- Added GM821 Parallel keyboard.
- Added info on the NASBUS.
23 October 2017
- Added more info, including circuit (thanks Steve!) on the GM811 processor card.
- Added info on RP/M (thanks again Steve! π )
1 July 2017
- Added GM808 EPROM programmer
16 June 2017
- Updated the Nascom-1 page with more photographs.
- Additional photo added to RAM-B Board.
- Manual added for the Henelec Prom-Prog.
13 June 2017
- GM860 EPROM Programmer added.
- New photos for Henelec EPROM programmer.
- Better copy of Nascom 8A supply manual.
12 June 2017
- New photos for Nascom-1, Nascom-2 & Nascom-IO board.
- New photo & update to G812 IVC card.
- New photo for G848 serial card.
- Henelec EPROM programmer info updated.
- Bigger pictures in Notes on Video Systems
11 June 2017
- Updated G833 info.
- Minor updates to the History section.
- Updates to The Hobbit info.
9 June 2017
- Added EPROM & FPCS boards
- Many photos replaced with better quality ones.
- Started a library of various manuals.
8 June 2017
- Henrys Radio Nascom-1 brochure added.
- Much more info about the Nascom keyboard.
- Restored a lot of Gemini specific pages to this site that had gone missing in the move 6 years ago. π
- Added a link to 80bus regarding info on Gemini cards.
- More info on the 80-Bus added.
Found thisΒ link to youtube about a GM925 computer – one that I didn’t know about. It is built using the GM813 processor, GM832 SVC card and GM849 FD drive card.
Added this page. π