Apple LC520 Specifications download pdf (Page 29)

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CHAPTER 1

Introduction

Keyboard 17

Note

The user must hold down a key combination for at least 1 second to

allow the ADB microcontroller enough time to respond to the NMI

or hard-reset signal. ◆

Note

The NMI in the Macintosh LC 520 computer can always be activated

from the keyboard. This is a change from the Macintosh LC computer,

where the keyboard NMI function can be deactivated by the software. ◆

Table 1-6 Reset and NMI key combinations

Key combination Function

Power (p) Power on and off

Command-Power (x-p) NMI (always active)

Control-Command-Power

(Control-x-p)

Reset

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 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 Specifications Page 29

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