NLQ Designer V1.2 (1985)(Watford Electronics)
Epson NLQ V1.0 (1984)(Watford Electronics)
Watford Print ROM V0.1E (1983)(Watford Electronics)
Watford Print ROM V0.1C (1983)(Watford Electronics)
Digitiser V1.00 (1985)(Watford Electronics)[a]
Watford Electronics DFS V1.43 (1985)(A.C. Bray)[a]