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Manuals and User Guides for NEC Advanced Personal Computer. We have
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NEC Advanced Personal Computer manual available for free PDF download: System Reference Manual
NEC Advanced Personal Computer System Reference Manual (276 pages)
Brand:
NEC
| Category:
Desktop
| Size: 13.77 MB
Table of Contents
6
Table of Contents
14
Preface
16
Chapter 1 Hardware Overview
17
System Block Diagram
20
Chapter 2 Processor Pcb
20
Processor PCB
21
Processor PCB Block Diagram
22
Mother Board/Card Cage Interface
23
Card Cage Socket Contact Assignments
23
Interrupt Lines
27
Processor Timing
29
RFSH Signal Timing
31
Device Interface Circuits
32
Microprocessor
33
Direct Memory Access
33
DMA Instructions
35
DMA Command and Mode Registers
36
DMA Request and Mask Register
38
Interval Timer
38
DMA Status Register
38
Interval Timer Block Diagram
39
Interrupt Control
39
Timer Commands
40
Interrupt Control Block Diagram
41
Interrupt Control Commands Summary
43
Interrupt Initialization Command Words
44
Interrupt Operation Command Words
45
Memory
45
System Memory Map
46
Main Memory
46
Main Memory Block Diagram
47
Battery-Backed Memory
47
Battery-Backed Memory Block Diagram
48
Read Only Memory
48
Parallel Printer Control
48
Interface
48
Programming Considerations
49
Parallel Printer Control Block Diagram
50
Parallel Printer Connectors Pin Assignments
52
Parallel Printer Interface Signals
54
Parallel Printer Controller Instruction
55
Parallel Printer Controller Interface Timing
55
Parallel Printer Controller Instruction Sequence
56
Parallel Printer Controller Interface at Paper Out Status
57
Keyboard
58
2.8.1 Keyboard Layout and Scan Codes
58
Keyboard Layout
60
Interface
60
Keyboard Interface
61
Calendar and Clock Generator
61
Keyboard Interface Lines
62
Circuit Description
62
Clock/Calendar Block Diagram
63
Clock/Calendar Instruction Format
63
Programming Considerations
64
Clock/Calendar Format
65
Jumper Settings
66
Chapter 3 Controller Pcb
66
Mother Board/Card Cage Interface
68
Controller PCB Block Diagram
69
Crt Display Control
69
Buffer Memory
70
Character-Code Representation in the Character Code
70
CRT Display Control Block Diagram
70
Display Buffer Memory
71
Attribute Description for Character Attribute Code
72
Controller PCB
73
Programming Considerations
74
GDC I/O-Address and Bit Map
75
Contents of the GDC Status Register
83
GDC Command Constants
85
Crt Display Unit
86
Flexible Disk Drive Controller
88
Bit Description of the FDC Main Status Register
89
Programming Considerations
92
FDC Commands
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