By Edward L. Braun
Electronic desktop layout, good judgment, Circuitry, and Synthesis
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Additional resources for Digital Computer Design. Logic, Circuitry, and Synthesis
24 2. , constants, initial values of problem parameters, and numbers generated during the computation which must be stored temporarily. (2) An accumulator, which is a special storage register associated with the arithmetic unit. It holds an operand in a form accessible to the arithmetic unit, allowing certain operations to be performed on it. In operations involving two operands, it holds one while the second is located in the store and transmitted to the arithmetic unit. Also, it serves to store a result until it can be transmitted elsewhere.
STORED PROGRAM DIGITAL COMPUTERS 27 In order to detect whether - JC + ;>i is a positive number or zero, the quantity - x + jyt is converted by means of the instructions in locations 005, 006 and 007 into the quantity χ - jyi (by storing - χ-\- jyi in loca tion 103 and then subtracting it from the cleared accumulator). If — χ + jyi is a positive number the conversion results in a negative number, if it is zero the conversion has no effect. If yi is a factor of x, χ - jyi is zero. In this case, the instruction Τ 010 advances control to location 009 and completion of the program.
Consideration of the example reveals the following important characteristics of computation with a stored program computer: (1) The number of different types of instructions that the computer must be capable of executing need not be large. (2) The number of instructions in the stored program is extremely small compared to the total number of instructions executed in the running of the program. This is possible because of the unconditional transfer instruction which may be used to provide recycling of a set of instructions.