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This is a ROM interface board for the ZX Spectrum. It presents a new, selectable ROM image for the machine, replacing the 1982 BASIC one found in the IC on the Spectrum's PCB. There are lots of these ...

Custom ROMs: ZX82 (Spectrum) and Microsoft Nascom Basic (modified Grant Seaerle's version: http://searle.hostei.com/grant/index.html) These are permanent work-in ...