Re: Gemini 80-Bus System
Here, as promised, are details of the boards in my machine.
There are 3 boards in the backplane :
GM829 Issue 2 FDC/SASI. This is cabled to the floppy drive and to a Xebec board linked to the ST412-interface hard disk.
GM812 Issue 2 IVC. Has ROMs IVC-MON V2.0 and IVC-GEN V1.0
GM813 Issue 3 CPU. Has ROM Simon V3.1MP
The IVC board has cables to the lightpen socket (5 pin DIN), video output (SO239) and Keyboard (DA15) on the rear of the case. I do find the use of a 1/4" jack for the video connector on the board a little odd.
The CPU board has cables to the cassette socket (5 pin DIN), serial (DB25) and parallel (36 pin Microribbon ('Centronics')) on the back. There's also a network card screwed to the side of the cardcage, its ribbon cable would fit in place of the parallel socket cable on the CPU board.
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