price: 14.99 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: http://rover.ebay.com/rover/1/710-53481-19255-0/1?ff3=4&pub=5575574818&toolid=10001&campid=5338662899&customid=&mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fitm%2FZX-ROM-CARTRIDGE-SLOT-for-the-ZX-SPECTRUM-NEW-from-Quazar%2F114240952078%3Fhash%3Ditem1a994a970e%3Ag%3AG4IAAOSw00Be0NYk