Apple LC520 Especificaciones descargar pdf (Pagina 63)

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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 +

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 73 74

Macintosh LC 520 Computer 1
Chapter 5 5
Appendix 5
Figures and Tables 7
About This Note 9
PREFACE 10
Typographical Conventions 0 11
Standard Abbreviations 0 11
Introduction 1 13
Summary of Features 1 14
Integrated Design 1 15
Built-in Color Display 1 16
Screen Control Pushbuttons 1 17
Power On and Off 1 18
Power Saver 1 19
RAM Expansion 1 20
Introduction 21
RAM Expansion 9 21
PDS Expansion Slot 1 22
SCSI Bus 1 22
CHAPTER 1 23
Serial I/O Ports 1 25
Keyboard 1 28
Architecture 2 31
Block Diagram 2 32
Architecture 33
Block Diagram 21 33
Figure 2-1 Block diagram 33
Combo Custom IC 2 34
Cuda ADB Controller 2 34
Sound Circuits 2 34
Address Map 2 35
24 Address Map 36
Video Display Timing 2 37
26 Video Display Timing 38
Video Display Timing 27 39
Parameter Value 39
28 Video Display Timing 40
Expansion 3 41
Expansion Slot 3 42
Expansion 43
Expansion Slot 31 43
Descriptions of the Signals 3 44
CHAPTER 3 45
Expansion Card Connectors 3 47
The PDS Expansion Card 48
Voltage Current 48
Software 4 49
ROM Software 4 50
One-Second Interrupt 4 51
Pushbutton Interrupts 4 51
Power Saver Software 4 51
Video Software 4 51
System Software 4 52
Sound Control Panel 4 53
The Screen Driver 4 54
Control 4 55
Status 4 56
Internal Storage Devices 5 57
Internal Storage Devices 58
Storage Device Slide-In Bays 58
Front Drive Bezel 5 59
Internal CD-ROM Drive 5 60
Internal CD-ROM Drive 49 61
Power for the CD-ROM Drive 5 62
Internal CD-ROM Integration 5 63
AppleCD 300i Speciﬁcations A 65
AppleCD 300i Speciﬁcations 66
Speciﬁcations 66
V, W, X, Y, Z 68
Foldouts 6 70
062-0487-B 72

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Apple LC520 Especificaciones Pagina 63

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