| 摘要 |
1,235,638. Computers. INTERNATIONAL BUSINESS MACHINES CORP. 1 Jan., 1970 [6 Jan., 1969], No. 130/70. Heading G4A. A computer system transfers work data between a work register and a data store location specified by address data as modified by index data, both address data and index data coming from the work register, and increments the index data. Local-storage work registers each contain a data field, an index field and an address field. An instruction for an execute operation specifies two of the registers to supply operands and one to receive the result, and contains a tag bit for each. If this tag bit for an operand is 1, then after gating the operand to the arithmetic logic unit, another operand is loaded into the register from the main store location specified by the sum of the address and index fields from the register and the index field is incremented and restored, these reload and increment operations being omitted if the tag bit is 0. If the tag bit for the result is 1, then after gating the result to the work register, the result is stored in the main memory with addressing and incrementing as above, these store and increment operations being omitted if the tag bit is 0. Thus an instruction can be executed repeatedly using different operands. Two-bit tags could be used to permit selection of a load or store operation. The address fields could select index registers providing the addresses. |
