there were 3 custom chips (ANTIC, GTIA and POKEY) 1 semi-custom (SALLY was a VERY MINOR modification of 6502) and 1 common industry chip (PIA). I would not say exactlly "lot of" ;-)
Well, relatively speaking that was a lot for late 1970s microcomputers. The original Apple ][ and TRS-80 Model I were essentially built from off the shelf chips (which is why both got off-brand clones).
