Joystick interface dk'tronics
Interface type: Kempston and sinclair joystick interface
Manufacturer: dk'tronics (UK)
Kempston port compatible with all models
Sinclair port doesn't work with spectrum +2A/B and spectrum +3
The left port simulates 6,7,8,9 & 0 keys (sinclair) and the right port simulates
IN(31) command (kempston).