OPUS DISCOVERY STUFF
SPECTRUM DISCOVERY CLUB NEWSLETTER
SPECTRUM DISCOVERY CLUB LIBRARY DISC
COMMERCIAL SOFTWARE FOR OPUS
OPUS DISCOVERY USER MANUAL (english)
OPUS DISCOVERY MANUALE UTENTE (italiano)
DHUO (Not really discovery stuff but Spectrum related anyway)
A little off topic ZX81 program snapshots
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To contact me: fadser@tiscali.NOUCE.it (remove the NOUCE part from the address )