NEC Advanced Personal Computer System Reference Manual page 9

List of Illustrations
Figure Title Page
1-1 System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-2
2-1 Processor PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
2-2 Processor PCB Block Diagram .............................. 2-2
2-3 Mother Board/Card Cage Intp.rface . . . . . . . . . . . . . . . . . . . . . . . . .. 2-3
2-4 Processor Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-8
2-5 DMA Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-9
2-6 RD Y Signal Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-10
2-7 RFSH Signal Timing ...................................... , 2-10
2-8 Processor
T
nterface Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-11
2-9 Device Interface Circuits ................................... 2-12
2-10 DMA Command and Mode Registers ........................ 2-16
2-11 DMA Request and Mask Register. . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-17
2-12 DMA Status Register ...................................... 2-19
2-13 Interval Timer Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-19
2-14 Interrupt Control Block Diagram ............................ 2-21
2-15 Interrupt Initialization Command Words ..................... 2-24
2-16 Interrupt Operation Command Words ............ , ........... 2-25
2-17 System Memory Map ...................................... 2-26
2-18 Main Memory Block Diagram ............................... 2-27
2-19 Battery-Backed Memory Block Diagram ...................... 2-28
2-20 Parallel Printer Control Block Diagram ....................... 2-30
2-21 Parallel Printer Cable Connections ........................... 2-32
2-22 Parallel Printer Controller Interface Timing ................... 2-36
2-23 Parallel Printer Controller Interface at Paper Out Status ........ 2-37
2-24 Keyboard Block Diagram ................................... 2-38
2-25 Keyboard Layout .......................................... 2-39
2-26 Keyboard Interface ........................................ 2-41
2-27 Clock/Calendar Block Diagram ............................. 2-43
2-28 Clock/Calendar Format .................................... 2-45
2-29 Proce<:sor PCB Jumper Settings .............................. 2-46
3-1 Controller PCB ..........................•................ 3-2
3-2 Controller PCB Block Diagram .............................. 3-3
3-3 CRT Display Control Block Diagram ........................ 3-5
3-4 Character-Code Representation in the Character Code
Buffer Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-5
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