Download Apple LC520 Specifications

Chapter 2
Architecture
19
Block Diagram
20
MC68030 Microprocessor
20
Ardbeg Custom IC
20
Ariel Custom IC
20
Combo Custom IC
22
Cuda ADB Controller
22
Sound Circuits
22
Sound Modes
22
Sample Rates
23
Address Map
23
RAM Addresses
23
Video RAM
25
Video Display Timing
25
Chapter 3
Expansion
29
Expansion Slot
30
Pin Assignments
30
Descriptions of the Signals
32
The PDS Expansion Card
34
Expansion Card Connectors
35
Address Space for the Expansion Card
Power for the Expansion Card
36
Chapter 4
Software
37
ROM Software
38
Unchanged Functions
38
MMU Initialization
38
Machine Identification
38
RAM Sizing and Addressing
38
One-Second Interrupt
39
Pushbutton Interrupts
39
Power Saver Software
39
Video Software
39
System Software
40
System Enabler
40
Booting From a CD-ROM
40
New Control Panels
40
Sound Control Panel
41
Screen Control Panel
42
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35