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  2. 256-bit computing - Wikipedia

    en.wikipedia.org/wiki/256-bit_computing

    SHA-256 hash function. Smart contracts use 256- or 257-bit integers; 256-bit words for the Ethereum Virtual Machine. "We realize that a 257 bits byte is quite unusual, but for smart contracts it is ok to have at least 256 bits numbers. The leading VM for smart contracts, Ethereum VM, introduced this practice and other blockchain VMs followed." [8]

  3. Zero page - Wikipedia

    en.wikipedia.org/wiki/Zero_page

    The size of a page depends on the context, and the significance of zero page memory versus higher addressed memory is highly dependent on machine architecture. For example, the Motorola 6800 and MOS Technology 6502 processor families treat the first 256 bytes of memory specially, [1] whereas many other processors do not.

  4. Zero page (CP/M) - Wikipedia

    en.wikipedia.org/wiki/Zero_page_(CP/M)

    In 8-bit CP/M versions it is located in the first 256 bytes of memory, hence its name. The equivalent structure in DOS is the Program Segment Prefix (PSP), a 256-byte (page-sized) structure, which is by default located exactly before offset 0 of the program's load segment, rather than in segment 0.

  5. Page (computer memory) - Wikipedia

    en.wikipedia.org/wiki/Page_(computer_memory)

    Virtual memory; Zero page - a (often 256-bytes large [37] [38]) memory area at the very start of a processor's address room;

  6. CSG 65CE02 - Wikipedia

    en.wikipedia.org/wiki/CSG_65CE02

    The zero-page, the first 256 bytes of memory that were used as pseudo-registers, could now be moved to any page in main memory using the B(ase page) register. The stack register was widened from 8 to 16-bits using a similar page register, SPH (stack pointer high), allowing the stack to be moved out of page one and to grow to larger sizes.

  7. Cache placement policies - Wikipedia

    en.wikipedia.org/wiki/Cache_placement_policies

    Consider a main memory of 16 kilobytes, which is organized as 4-byte blocks, and a direct-mapped cache of 256 bytes with a block size of 4 bytes. Because the main memory is 16kB, we need a minimum of 14 bits to uniquely represent a memory address. Since each cache block is of size 4 bytes, the total number of sets in the cache is 256/4, which ...

  8. MCS-51 - Wikipedia

    en.wikipedia.org/wiki/MCS-51

    MCS-51-based microcontrollers typically include one or two UARTs, two or three timers, 128 or 256 bytes of internal data RAM (16 bytes of which are bit-addressable), up to 128 bytes of I/O, 512 bytes to 64 KB of internal program memory, and sometimes a quantity of extended data RAM (ERAM) located in the external data space. External RAM and ROM ...

  9. Memory address - Wikipedia

    en.wikipedia.org/wiki/Memory_address

    For instance, many 8-bit processors, such as the MOS Technology 6502, supported 16-bit addresses— if not, they would have been limited to a mere 256 bytes of memory addressing. The 16-bit Intel 8088 and Intel 8086 supported 20-bit addressing via segmentation , allowing them to access 1 MiB rather than 64 KiB of memory.