CD player compatibility   System software 3 MB  ROM version 7.7.D  (version number on ROM boards is development 1.1, 1.2; production 1.3). Runtime environment derived from  System 7 , System 7.5.2 (if used, Enabler 1.1). PowerPC  native version of  QuickDraw . Reduced system memory footprint (most computer extensions features removed). Disk-resident System Software