发明名称 |
Indirect arithmetic control |
摘要 |
Circuits for the improved operation of microprogrammable computers are described. This improvement is accomplished by providing a set of read-only memory devices for storing the micro-code for all combinations of arithmetic logic unit function, carry bit and file register address than can be specified by an instruction word executed from Main Memory. In a universal microprogram designed to execute that family of Main Memory instructions that differ only in the functions specified above, the instruction word is used to address the read-only memory devices, the micro-code output of which is used to control the file, carry in bit and arithmetic logic unit. Through the use of these circuits a family of instructions may be executed by a single microprogram and at no increase in execution time over that required for the execution of a microprogram dedicated to a single instruction.
|
申请公布号 |
US3942156(A) |
申请公布日期 |
1976.03.02 |
申请号 |
US19730425352 |
申请日期 |
1973.12.17 |
申请人 |
XEROX CORPORATION |
发明人 |
MOCK, HOWARD C.;ISAAC, KENNETH N.;DISPARTE, CHARLES P.;HALL, WARREN L. |
分类号 |
G06F9/22;(IPC1-7):G06F13/00;G06F13/06 |
主分类号 |
G06F9/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|