After Amstrad took over Sinclair, the Spanish distributor Investrónica continued selling their own design, the Inves Spectrum+. The ROM was heavily based on that of the ZX Spectrum 128, which was also designed by Investrónica; it even still contained the SPECTRUM and PLAY commands of the ZX Spectrum 128 (but are no longer available).
The Spectrum+ has a built-in joystick port, compatible with the Kempston standard (IN 31).