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Processor PCB
2-2
The principal functional components and their interrelationships are shown on the
block diagram of the Processor PCB (see Figure 2-2). The major elements of the
PCB consist of the following functional areas:
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• An NEC pPD8086 microprocessor, which is
1) Fully compatible with the Intel 8086 microprocessor
2)
3)
Capable of addressing one MB of memory
Driven by an NEC pPD8284 clock generator at 4.9152 MHz
• A 20-bit bidirectional address bus, 16 bits of which serve also as the data
bus, and related buffers, controls, and ports
• A DMA controller to permit high speed data transmission between input/
output devices without intervention of the microprocessor
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Figure 2-2 Processor PCB Block Diagram
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