Digitiser V1.00 (1985)(Watford Electronics)[a]
Watford Print ROM V0.1E (1983)(Watford Electronics)
Watford Print ROM V0.1C (1983)(Watford Electronics)
Watford Electronics DDFS+ V0.91 (1985)(A.C. Bray)
NLQ Designer V1.3 (1985)(Watford Electronics)
Watford Electronics DFS V1.43 (1985)(A.C. Bray)