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  2. Addressing mode - Wikipedia

    en.wikipedia.org/wiki/Addressing_mode

    Furthermore, an addressing mode which, in one given architecture, is treated as a single addressing mode may represent functionality that, in another architecture, is covered by two or more addressing modes. For example, some complex instruction set computer (CISC) architectures, such as the Digital Equipment Corporation (DEC) VAX, treat ...

  3. ModR/M - Wikipedia

    en.wikipedia.org/wiki/ModR/M

    This addressing mode is used for the Intel MPX instructions BNDLDX [1]: 3-112 and BNDSTX. [1]: 3-120 SIBMEM addressing. This addressing mode is used for instructions that perform a sequence of strided memory accesses. The effective address to use for the first of these accesses is given by base + displacement - the stride to add to this ...

  4. Simplified Instructional Computer - Wikipedia

    en.wikipedia.org/wiki/Simplified_Instructional...

    For example, the top line is an 'H' record, the first 6 hex digits signify its relative starting location, and the last 6 hex digits represent the program's size. The lines throughout are similar, with each 'T' record consisting of 6 hex digits to signify that line's starting location, 2 hex digits to indicate the size (in bytes) of the line ...

  5. Instruction set architecture - Wikipedia

    en.wikipedia.org/wiki/Instruction_set_architecture

    (In the examples that follow, a, b, and c are (direct or calculated) addresses referring to memory cells, while reg1 and so on refer to machine registers.) C = A+B 0-operand (zero-address machines), so called stack machines: All arithmetic operations take place using the top one or two positions on the stack: [9] push a, push b, add, pop c.

  6. PDP-11 architecture - Wikipedia

    en.wikipedia.org/wiki/PDP-11_architecture

    The last two components depend on the addressing mode. For example, on the PDP-11/70 (circa 1975), an instruction of the form ADD x(Rm),y(Rn) had a fetch/execute time of 1.35 microseconds plus source and destination times of 0.6 microseconds each, for a total instruction time of 2.55 microseconds. Any case where addressed memory is not in the ...

  7. Orthogonal instruction set - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_instruction_set

    However, addressing modes 0–3 were "short immediate" for immediate data of 6 bits or less (the 2 low-order bits of the addressing mode being the 2 high-order bits of the immediate data, when prepended to the remaining 4 bits in that data-addressing byte). Since addressing modes 0-3 were identical, this made 13 (electronic) addressing modes ...

  8. Complex instruction set computer - Wikipedia

    en.wikipedia.org/wiki/Complex_instruction_set...

    Before the RISC philosophy became prominent, many computer architects tried to bridge the so-called semantic gap, i.e., to design instruction sets that directly support high-level programming constructs such as procedure calls, loop control, and complex addressing modes, allowing data structure and array accesses to be combined into single instructions.

  9. Comparison of instruction set architectures - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_instruction...

    An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.