Apple LC520 Specifications download pdf (Page 39)

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CHAPTER 2

Architecture

Video Display Timing 27

When the Apple IIe Card for the Macintosh is installed in the expansion slot, the

Macintosh LC 520 computer generates a 560-by-384-pixel video display. Table 2-2 lists the

video parameters for the Apple IIe display and Figure 2-4 on page 28 shows the timing

and synchronizing signals.

Table 2-2 Video parameters for the Apple IIe display

Parameter Value

Dot clock 17.234 MHz

Dot time 58.02 ns

Line rate 24.48 kHz

Line time 40.85 µs

Frame rate 60.15 Hz

Frame time 16.63 ms

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 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 39

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