Following the launch of the ZX Interface 2, a number of manufacturers produced equivalent interfaces providing joystick and ROM cartridge capabilities. Some of these interfaces extended the joystick functionality to also support the Kempston and Cursor standards. They were also more competitively priced than the ZX Interface 2.
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| Kempston Pro |
The Kempston Pro interface supported the Kempston, Cursor and Sinclair standards, and retailed at £16.95.
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| RAM Turbo |
The RAM Turbo interface also supported the Kempston, Cursor and Sinclair standards and had a full through edge connector. It was later sold with the ROM cartridge socket removed to reduce manufacturing costs. The outer casing remained the same however and so it was possible to solder a socket onto the printed circuit board. The interface had a power safety feature to make it more difficult to plug / unplug it whilst the Spectrum was powered on. The RAM Turbo interface retailed at £22.95, later dropping to £18.50.
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| AGF RamSlot |
The AGF RamSlot cost £9.95 and only provided ROM cartridge support.
