Link 1 talking about "La Corona" taken from http://computeremuzone.metropoliglobal.com/fichas/l/la_corona.htm

Link 2 talking about "Johny Vayna" taken from http://andercheran.aiind.upv.es/raul/caad/cgi-bin/caad.cgi?numero=24&articulo=western.htm

Link 3 an interview for the CAAD fanzine taken from http://andercheran.aiind.upv.es/raul/caad/cgi-bin/caad.cgi?numero=17&articulo=15pregun.htm

You can download these games:
La Corona - ZX Spectrum
La Corona - Amstrad CPC
Johny Vayna - ZX Spectrum (part I)
Johny Vayna - ZX Spectrum (part II)

In order to execute the programs, you need a emulator like these:
Emulator for the ZX-Spectrum
Emulator for the CPC Amstrad