g860f

This appears to be brand new and unused, but it might just have been looked after. The ribbon cable shown appears to be unconnected and still wrapped in its original tape (it’s been kept clean in a polythene bag for many years). I’ve no software or manual (yet…).

g860t

Apart from the power switch there are no controls – it was software driven from the computer. It was capable of burning EPROMs up to 32kB x 8 in both 24-pin and 28-pin sizes. Address line A15 appears to be latched in IC10, but it isn’t connected so 64kB addressing isn’t implemented.

g860b

The ribbon cable is used to connect the programmer to the computer’s Centronics printer port, usually driven from a PIO. (Thanks Danny).

And the circuit diagram:  (Cheers Danny! 🙂 )

GM860_Circuit

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