| 摘要 |
resetting PAL IC(2); setting a bus inspecting program call instruction(BUSSVC*) as "1"; detecting whether a bus use response input signal(BGiN*) and a bus request signal(MYBR*) are "0"; returning to the previous step if BGiN* and MYBR* are not "0", and setting BUSSVC* as "0" otherwise; detecting whether one of BBSY* and a bus use request signal(BR*) is "0"; returing to the previous step if one of BBSY* and BR* is "0", and setting BUSSVC* as "0"; and controlling BR* according to the status of BUSSVC*.
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