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  2. Program status word - Wikipedia

    en.wikipedia.org/wiki/Program_status_word

    Contained within the PSW are the two bit condition code, representing zero, positive, negative, overflow, and similar flags of other architectures' status registers. Conditional branch instructions test this encoded as a four bit value, with each bit representing a test of one of the four condition code values, 2 3 + 2 2 + 2 1 + 2 0. (Since IBM ...

  3. IBM Machine Code Printer Control Characters - Wikipedia

    en.wikipedia.org/wiki/IBM_Machine_Code_Printer...

    IBM defined two sets of printer commands, and therefore two sets of printer control characters are available. The first set of commands did not send any data to be printed to the printer but only a paper movement instruction. These are called immediate commands. The second set of commands send data to be printed on the current line plus a paper ...

  4. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    Unless otherwise stated, the status code is part of the HTTP standard. [1] The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes. [2] All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two ...

  5. z/Architecture - Wikipedia

    en.wikipedia.org/wiki/Z/Architecture

    In addition to the two addressing modes supported by S/370-XA and ESA, a/Architecture has an extended addressing mode with 64-bit virtual addresses. The addressing mode is controlled by the EA (bit 31) and BA (bit 32) bits in the PSW. The valid combinations are 00 24-bit addressing; 01 31-bit addressing; 11 64-bit addressing

  6. IBM System/360 architecture - Wikipedia

    en.wikipedia.org/wiki/IBM_System/360_architecture

    4 64-bit floating-point registers; 64-bit processor status register (PSW), which includes a 24-bit instruction address; 24-bit (16 MB) byte-addressable memory space; Big-endian byte/word order; A standard instruction set, including fixed-point binary arithmetic and logical instructions, present on all System/360 models (except the Model 20, see ...

  7. Personal Printer Data Stream - Wikipedia

    en.wikipedia.org/wiki/Personal_Printer_Data_Stream

    Personal Printer Data Stream is a general name for a family of page description language used by IBM printers, which includes all Proprinter, Quietwriter, Quickwriter, LaserPrinter 4019, and LaserPrinter 4029 commands. PPDS was introduced to control printers in 1981 with the launch of IBM Graphics Printer 5152.

  8. PIC instruction listings - Wikipedia

    en.wikipedia.org/wiki/PIC_instruction_listings

    It added a signed overflow bit to the status register (bit 3). Status register bits 4 and 5 provided read-only access to the high 2 bits of the 10-bit program counter. The instruction set is mostly the same as the 12-bit PIC with the address field enlarged. However, the 8-bit immediate instructions gain an additional opcode bit.

  9. x86 instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_instruction_listings

    The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386: