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Assembly language and assemblers
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A-register accumulator action ADDR address bus address number addressing methods arithmetic assembly language program BASIC program binary number BIT BIT BIT BUFFER byte stored CALL carry bit carry flag cassette character chip clock cycles contents count cursor data byte DEC BC denary digit displacement byte double registers example executed hardware INC HL index registers input/output inputs and outputs instruction byte interrupt label name LD A,(HL LD HL loaded loop machine code machine-code program machine-code routine means memory address MENTA microprocessor microprocessor system mnemonics needed non-maskable interrupt normal opcode operand operating system port program counter reset result screen address screen memory shown in Fig signals single byte single-byte registers stack pointer starting address step subroutine subtraction three bytes voltage write Z-80 assembly language zero ZX Spectrum