Principles of Computer Systems
Describes computer system concepts in simple terms and offers information on how the low-level, compiler/interpreter activities of computers - arithmetic, I/O, array processing, character strings functions - are performed. A fictitious computer (CUSP), is used to exemplify the concepts discussed.
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The Basic Instruction Set
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addressing mode addressing value allocated array ASCII assembler binary BLKW buffer byte cell Chapter char character CHASM contents control register counter cursor CUSP CUSP machine CUSP program CUSP's decimal digits direct addressing display elements ENDIF example execution factorial flag floating point formal parameters function hexadecimal I/O ports implementation Increment indexed addressing insert instruction cycle integer interrupt interrupt request jump instructions keyboard LDA+ linked list loaded loop MALLOC matrix memory location mnemonic object code offset opcode operand operation OUTB overflow Pascal pointer procedure PSHA PSHX queue recursive result saved FP saved PC sequence shown in Figure stack frame status register Step stored string subroutine subroutine call subtraction symbol tail recursive tape timer two's complement unsigned variable zero