price: 16.99 GBP platforms: Spectrum
Interface 2 style cartridge slot
Initially there were just 10 cartridges released back in 1983/4 but there have been third party ones since.
Compatible with all models of ZX Spectrum. There's a small switch on the interface to select the type of computer, which can be set as: 16K/48K/128K/+2 or +2A/+2B/+3
Also has a reset button.
Find out more / buy at: https://www.ebay.co.uk/itm/ZX-ROM-CARTRIDGE-SLOT-v1-1-for-ZX-SPECTRUM-inc-Next-N-Go-NEW-from-Quazar/114728135243?hash=item1ab6546a4b:g:NhgAAOSwu51gT4NO&mkcid=1&mkrid=710-53481-19255-0&siteid=3&campid=5338662899&customid=&toolid=10001&mkevt=1