ZX Spectrum 27C512 EPROM Adapter
This adapter board allows you to replace the original ROM of a ZX Spectrum 48K with a 27C512 (64KB) EPROM, giving you space for multiple ROM images. Useful for switching between different BASIC versions, custom ROMs, diagnostics tools, etc. This build is meant for testing and experimenting; the adapter does not fit inside a standard ZX Spectrum 48K case.
Any other details like BOM or schematics you can find on github.
ZX Spectrum 27C512 EPROM Adapter
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