>The Amiga 500 schematics aren't so rare. Every A500 that was sold came with them in the Amiga 500 User's Manual.
That was a a5 version. The one I got from the Corby rubbish skips...was a3 like this, got a folder with the c64 and 1541 ones too . I did have a Vic20 one but I've lost that somewhere.
