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In computer architecture, 256-bit integers, memory addresses, or other data units are those that are 256 bits (32 octets) wide. Also, 256-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers , address buses , or data buses of that size.
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.
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 ...
The virtual machine uses almost 8 kilobytes of code memory (entire flash in case of ATmega8) and 256 bytes of RAM. Every user's .class are processed by NanoVM's Converter which transforms it into one bytecode file. Special tools next send this file through serial line into device.
An example of this approach is the MOS 6502, which had only a single register, in which case it is referred to as the accumulator, and a special "zero page" addressing mode that treated the first 256 bytes of memory as if they were registers. Placing code and data in the zero page meant the instruction was only two bytes long instead of three ...
In a computer using virtual memory, accessing the location corresponding to a memory address may involve many levels. In computing, a memory address is a reference to a specific memory location in memory used by both software and hardware. [1] These addresses are fixed-length sequences of digits, typically displayed and handled as unsigned ...
Memory (second byte of instruction is the address of the operand) Indirect (second byte of instruction is the address of the address of the operand) Indexed (second byte of instruction is added to X to form the address of the operand) Indirect Indexed (second byte of instruction points to a location which is added to X to form the address of ...
The beginning of H forms the array of contexts. An assembly language-like program is called once for each coded or decoded byte with that byte as input in A. The final context seen by the COMP section is the computed context combined with the previously seen bits of the current byte.