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Advanced Personal Computer
System reference manual
NEC Advanced Personal Computer System Reference Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Preface
Chapter 1 Hardware Overview
System Block Diagram
Chapter 2 Processor Pcb
Processor PCB
Processor PCB Block Diagram
Mother Board/Card Cage Interface
Card Cage Socket Contact Assignments
Interrupt Lines
Processor Timing
RFSH Signal Timing
Device Interface Circuits
Microprocessor
Direct Memory Access
DMA Instructions
DMA Command and Mode Registers
DMA Request and Mask Register
Interval Timer
DMA Status Register
Interval Timer Block Diagram
Interrupt Control
Timer Commands
Interrupt Control Block Diagram
Interrupt Control Commands Summary
Interrupt Initialization Command Words
Interrupt Operation Command Words
Memory
System Memory Map
Main Memory
Main Memory Block Diagram
Battery-Backed Memory
Battery-Backed Memory Block Diagram
Read Only Memory
Parallel Printer Control
Interface
Programming Considerations
Parallel Printer Control Block Diagram
Parallel Printer Connectors Pin Assignments
Parallel Printer Interface Signals
Parallel Printer Controller Instruction
Parallel Printer Controller Interface Timing
Parallel Printer Controller Instruction Sequence
Parallel Printer Controller Interface at Paper out Status
Keyboard
2.8.1 Keyboard Layout and Scan Codes
Keyboard Layout
Interface
Keyboard Interface
Calendar and Clock Generator
Keyboard Interface Lines
Circuit Description
Clock/Calendar Block Diagram
Clock/Calendar Instruction Format
Programming Considerations
Clock/Calendar Format
Jumper Settings
Chapter 3 Controller Pcb
Mother Board/Card Cage Interface
Controller PCB Block Diagram
Crt Display Control
Buffer Memory
Character-Code Representation in the Character Code
CRT Display Control Block Diagram
Display Buffer Memory
Attribute Description for Character Attribute Code
Controller PCB
Programming Considerations
GDC I/O-Address and Bit Map
Contents of the GDC Status Register
GDC Command Constants
Crt Display Unit
Flexible Disk Drive Controller
Bit Description of the FDC Main Status Register
Programming Considerations
FDC Commands
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