Specifications

CHAPTER 5
Internal Storage Devices
Internal CD-ROM Drive 51
Note
The AppleCD 300i CD-ROM drive connects to the internal SCSI bus. The
drive does not have a SCSI terminator, because the internal SCSI bus is
terminated in the built-in hard disk. ◆
Internal CD-ROM Integration 5
Apple’s internal CD-ROM drive uses SCSI ID number 3.
Audio from the CD-ROM is connected to the computer by a separate connector adapter.
Figure 5-7 shows the pin assignments. Each channel has its own ground return; the
computer’s audio circuits have differential inputs. The maximum signal level for the
audio is 0.7 V ± 0.1 V RMS at 47 KΩ.
Figure 5-7 Pins on the CD-ROM audio connector
Key flange
1. Right audio +
2. Right audio –
3. Left audio –
4. Left audio +