| 摘要 |
PURPOSE:To improve performance and reduces a micro instruction string by using the external additional hardware of a processor to execute a part of the micro instruction string which executes a macro instruction. CONSTITUTION:When the instruction address of a macro instruction is inputted to an adapter 5 from a processor 11 through an extended data bus 17, it is sent to a main memory through a main address bus 19 to independently access the memory. Read data is stored in the adapter 5 by a transfer control circuit 4. when the processor 1 fetches the instruction with a micro instruction, the adapter 5 sends one or two designated bytes of the stored macro instruction string to the processor 1. Consequently, since the required macro instruction is read out to the adapter 5 before the processor 1 fetches the instruction, the execution time is shortened and the capacity of CS where the micro instruction string is stored is reduced.
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