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 (276 pages)

Brand: NEC | Category: Desktop | Size: 13.77 MB

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................................................................................................................................................................