EPROM programmer to plug into the Nascom-1 PIO port. Note that the PIO connection on the Nascom-2 and all successive boards was a proper ribbon-mounted female header plug rather than two DIL headers.
This is the Henelec “Prom-Prog” EPROM programmer. It would only handle 2708s but it was relatively cheap and any bigger EPROMs were expensive. 🙂 I built it from a kit and have used it many times.
The supplied manual is here: Henelec prom-prog
nascom.info 