| 摘要 |
PURPOSE:To change easily and rapidly an I/O control microprogram by deciding a jump instruction, jumping an address to the position to which address to be jumped and sending data in the prescribed order of addresses. CONSTITUTION:A RAM2 accumulating correction data for correcting program accumulated in a ROM1 in the order of addresses is prepared. When an address in the ROM1 coincides with an address of the ROM1 which is held in the RAM2 and requested to correct, the correction data held in the RAM2 at the address are outputted to an I/O device 3. When the output of the ROM1 is used as the address of the ROM1, the difference between said address and the address of the ROM1 which is held in the RAM2 and requested to correct is found out and the address of the RAM2 is forwarded or backwarded to update the address of the RAM2 to an address corresponding to the correction data to be outputted successively.
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