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In a computer's central processing unit (CPU), the accumulator is a register in which intermediate arithmetic logic unit results are stored.. Without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to cache or main memory, perhaps only to be read right back again for use in the next operation.
The hardware unit that performs the operation is known as a multiplier–accumulator (MAC unit); the operation itself is also often called a MAC or a MAD operation. The MAC operation modifies an accumulator a : a ← a + ( b × c ) {\displaystyle a\gets a+(b\times c)}
Accumulator (computing), in a CPU, a processor register for storing intermediate results; Accumulator (computer vision), discrete cell structure to count votes, standard component of the Hough transform; Accumulator (cryptography), a value, determined by a set of values, that allows one to verify if any one of the original values is a member of ...
In 1967, Fairchild introduced the first ALU-like device implemented as an integrated circuit, the Fairchild 3800, consisting of an eight-bit arithmetic unit with accumulator. It only supported adds and subtracts but no logic functions. [7] Full integrated-circuit ALUs soon emerged, including four-bit ALUs such as the Am2901 and 74181.
Three digits of one accumulator (#6) were used as the program counter, another accumulator (#15) was used as the main accumulator, a third accumulator (#8) was used as the address pointer for reading data from the function tables, and most of the other accumulators (1–5, 7, 9–14, 17–19) were used for data memory.
The W65C816S is a newer variant of the 65C816, which is the core of the Apple IIGS computer and is the basis of the Ricoh 5A22 processor that powers the Super Nintendo Entertainment System. The W65C816S incorporates minor improvements over the 65C816 that make the newer chip not an exact hardware-compatible replacement for the earlier one.
System Mechanic has been rebuilt to have lighter footprint on your computer, and to be smaller and faster. System Mechanic features OptiCore™ - OptiCore™ automatically de-prioritizes programs it detects aren’t essential to the task you’re performing, delivering more core power and speed to your active apps.
Registers are normally measured by the number of bits they can hold, for example, an 8-bit register, 32-bit register, 64-bit register, 128-bit register, or more.In some instruction sets, the registers can operate in various modes, breaking down their storage memory into smaller parts (32-bit into four 8-bit ones, for instance) to which multiple data (vector, or one-dimensional array of data ...