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  2. Data Encryption Standard - Wikipedia

    en.wikipedia.org/wiki/Data_Encryption_Standard

    Expansion: the 32-bit half-block is expanded to 48 bits using the expansion permutation, denoted E in the diagram, by duplicating half of the bits. The output consists of eight 6-bit (8 × 6 = 48 bits) pieces, each containing a copy of 4 corresponding input bits, plus a copy of the immediately adjacent bit from each of the input pieces to ...

  3. DES supplementary material - Wikipedia

    en.wikipedia.org/wiki/DES_supplementary_material

    Given a 6-bit input, the 4-bit output is found by selecting the row using the outer two bits, and the column using the inner four bits. For example, an input " 0 1101 1 " has outer bits " 01 " and inner bits "1101"; noting that the first row is "00" and the first column is "0000", the corresponding output for S-box S 5 would be "1001" (=9), the ...

  4. Physical Address Extension - Wikipedia

    en.wikipedia.org/wiki/Physical_Address_Extension

    Thus, from 64 bits in the page table entry, 12 low-order and 12 high-order bits have other uses, leaving 40 bits (bits 12 though 51) for the physical page number. Combined with 12 bits of "offset within page" from the linear address, a maximum of 52 bits are available to address physical memory.

  5. Comparison of executable file formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_executable...

    Phar Lap 16-bit DOS extenders.EXP: Un­known (286 and higher only) Yes No No Un­known Un­known No No No P3: Phar Lap 32-bit DOS extenders.EXP: Un­known (386 and higher only) Yes No No Un­known Un­known No No No GEOS PC/GEOS, Geoworks Ensemble, NewDeal Office, Breadbox Ensemble.GEO: Un­known (x86 only) Un­known Un­known No Un­known Un ...

  6. Extended precision - Wikipedia

    en.wikipedia.org/wiki/Extended_precision

    1: anything: Pseudo Denormal. The 80387 and later properly interpret this value but will not generate it. The value is (−1) s × m × 2 −16382 bits 78–64 bits 63–62 bits 61–0; all 1: 00: 0: Pseudo-infinity. The sign bit gives the sign of the infinity. The 8087 and 80287 treat this as Infinity. The 80387 and later treat this as an ...

  7. Eb/N0 - Wikipedia

    en.wikipedia.org/wiki/Eb/N0

    If signal power is in watts and bit rate is in bits per second, is in units of joules (watt-seconds). N 0 {\displaystyle N_{0}} is the noise spectral density , the noise power in a 1 Hz bandwidth, measured in watts per hertz or joules.

  8. Data-rate units - Wikipedia

    en.wikipedia.org/wiki/Data-rate_units

    The ISQ symbols for the bit and byte are bit and B, respectively.In the context of data-rate units, one byte consists of 8 bits, and is synonymous with the unit octet.The abbreviation bps is often used to mean bit/s, so that when a 1 Mbps connection is advertised, it usually means that the maximum achievable bandwidth is 1 Mbit/s (one million bits per second), which is 0.125 MB/s (megabyte per ...

  9. Bit numbering - Wikipedia

    en.wikipedia.org/wiki/Bit_numbering

    Similarly, the most significant bit (MSb) represents the highest-order place of the binary integer. The LSb is sometimes referred to as the low-order bit or right-most bit, due to the convention in positional notation of writing less significant digits further to the right. The MSb is similarly referred to as the high-order bit or left-most bit.