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Basic Concepts and Terminology
Simplified InputOutput Circuits
FixedPoint Binary Arithmetic
40 other sections not shown
accumulator active actual address bus allow application ASCII block buffer byte counter called carry flag Chapter character circuit clock control bus data bus debug decimal decoder DECREMENT digit discussed display DLOAD EPROM external flag Set flow chart function gram hardware hexadecimal high logic level I/O device I/O ports identify index register initial input instruction set interrupt IORQ jump instruction keyboard latch LD HL loaded machine cycle main program memory location microprocessor Mnemonic mode modules object code operation output port parity perform PLSDLY program counter program flow program segment pulse radix point register pair HL relative jump reset SAVE sequential serial shift shown in Figure signal simply specific status flags stored STROBE struction structure subroutine switches sync characters synchronization Table technique tion transfer transmitted USART voltage Z-80 instruction zero flag