NEC Advanced Personal Computer Manuals

Manuals and User Guides for NEC Advanced Personal Computer. We have 1 NEC Advanced Personal Computer manual available for free PDF download: System Reference Manual

NEC Advanced Personal Computer System Reference Manual

NEC Advanced Personal Computer System Reference Manual (276 pages)

Brand: NEC | Category: Desktop | Size: 13.77 MB
Table of contents
Table Of Contents6................................................................................................................................................................
Preface14................................................................................................................................................................
Chapter 1 Hardware Overview16................................................................................................................................................................
System Block Diagram17................................................................................................................................................................
Chapter 2 Processor Pcb20................................................................................................................................................................
Processor Pcb20................................................................................................................................................................
Processor Pcb Block Diagram21................................................................................................................................................................
Mother Board/card Cage Interface22................................................................................................................................................................
Card Cage Socket Contact Assignments23................................................................................................................................................................
Interrupt Lines23................................................................................................................................................................
Processor Timing27................................................................................................................................................................
Rfsh Signal Timing29................................................................................................................................................................
Device Interface Circuits31................................................................................................................................................................
Microprocessor32................................................................................................................................................................
Direct Memory Access33................................................................................................................................................................
Dma Instructions33................................................................................................................................................................
Dma Command And Mode Registers35................................................................................................................................................................
Dma Request And Mask Register36................................................................................................................................................................
Interval Timer38................................................................................................................................................................
Dma Status Register38................................................................................................................................................................
Interval Timer Block Diagram38................................................................................................................................................................
Interrupt Control39................................................................................................................................................................
Timer Commands39................................................................................................................................................................
Interrupt Control Block Diagram40................................................................................................................................................................
Interrupt Control Commands Summary41................................................................................................................................................................
Interrupt Initialization Command Words43................................................................................................................................................................
Interrupt Operation Command Words44................................................................................................................................................................
Memory45................................................................................................................................................................
System Memory Map45................................................................................................................................................................
Main Memory46................................................................................................................................................................
Main Memory Block Diagram46................................................................................................................................................................
Battery-backed Memory47................................................................................................................................................................
Battery-backed Memory Block Diagram47................................................................................................................................................................
Read Only Memory48................................................................................................................................................................
Parallel Printer Control48................................................................................................................................................................
Interface48................................................................................................................................................................
Programming Considerations48................................................................................................................................................................
Parallel Printer Control Block Diagram49................................................................................................................................................................
Parallel Printer Connectors Pin Assignments50................................................................................................................................................................
Parallel Printer Interface Signals52................................................................................................................................................................
Parallel Printer Controller Instruction54................................................................................................................................................................
Parallel Printer Controller Interface Timing55................................................................................................................................................................
Parallel Printer Controller Instruction Sequence55................................................................................................................................................................
Parallel Printer Controller Interface At Paper Out Status56................................................................................................................................................................
Keyboard57................................................................................................................................................................
2.8.1 Keyboard Layout And Scan Codes58................................................................................................................................................................
Keyboard Layout58................................................................................................................................................................
Keyboard Interface60................................................................................................................................................................
Calendar And Clock Generator61................................................................................................................................................................
Keyboard Interface Lines61................................................................................................................................................................
Circuit Description62................................................................................................................................................................
Clock/calendar Block Diagram62................................................................................................................................................................
Clock/calendar Instruction Format63................................................................................................................................................................
Clock/calendar Format64................................................................................................................................................................
Jumper Settings65................................................................................................................................................................
Chapter 3 Controller Pcb66................................................................................................................................................................
Controller Pcb Block Diagram68................................................................................................................................................................
Crt Display Control69................................................................................................................................................................
Buffer Memory69................................................................................................................................................................
Display Buffer Memory70................................................................................................................................................................
Crt Display Control Block Diagram70................................................................................................................................................................
Character-code Representation In The Character Code70................................................................................................................................................................
Attribute Description For Character Attribute Code71................................................................................................................................................................
Controller Pcb72................................................................................................................................................................
Gdc I/o-address And Bit Map74................................................................................................................................................................
Contents Of The Gdc Status Register75................................................................................................................................................................
Gdc Command Constants83................................................................................................................................................................
Crt Display Unit85................................................................................................................................................................
Flexible Disk Drive Controller86................................................................................................................................................................
Bit Description Of The Fdc Main Status Register88................................................................................................................................................................
Fdc Commands92................................................................................................................................................................

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