data module digital i/o board.
. 3-1
Digital I/O, 8255 Programmable Peripheral Interface 3-3 Timer/Counters 3-4 Interrupts 3-4
CHAPTER 4 — BOARD OPERATION AND PROGRAMMING . 4-1
Defining the I/O Map . 4-3 BA + 0: PPI Port A — Digital I/O (Read/Write) .... 4-3 BA + 1: PPI Port B.
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