Retrobit – Kartridże, akcesoria i płytki do Commodore 64, ZX Spectrum, Atari | Polska produkcja
ZX Spectrum Interface 2 Adapter
With this adapter, you can use ZX Flash ROM cartridges with the ZX Spectrum 48k and +128k.
Case colors are available from a very wide range of filaments in stock.
https://trastero.speccy.org/cosas/droy/zxflash/zxflashcart_e.htm