The card is ideal for testing, repairing and programming on the ZX Spectrum

•  Small in size, compact to fit onto ZX Spectrum edge connector
•  128KB memory capacity: Up to 8 optional 16KB ROMs
•  Select ROM by rotating BCD DIP switch, position 0-7
•  Completely through bus to connector identical to ZX Spectrum edge connector
•  Generator and NMI signal button
•  RESET button
•  Possibility of blocking external ROM by hardware or software

The card is fully supported with all features by a great Brendan Alford's test ROM v0.37+
(https://github.com/brendanalford/zx-diagnostics/wiki)

External ROM card 128KB
External ROM card 128KB
External ROM card 128KB
External ROM card 128KB
External ROM card 128KB
External ROM card 128KB
     External ROM card 128KB: