Baloui; Brückmann; Englisch; Felt; Gelfand; Gerits; Krsnik:
Das neue Commodore 64 Intern Buch.
Düsseldorf: Data Becker, 1990.
ISBN 3-89011-307-9
(850 pages, 45.1 MB PDF)
I have scanned and OCRed the included commented ROM disassembly before, it’s available here.