?????????????????????????????

????1?????μ??????????弰?????豸???磻
????2??????о?????CPU????RESET????cpu???????
????3??о??鳷?RESET????CPU???????FFFF0H??????????//FFFFOH?????????????????????BIOS????洢???
??????????μ????????????в????????cpu????????????????????RESET????????CPU????????
????4??CPU?????BIOS????
????4.1 ??????????
????a??????POST??Power On Self Test????????????????Щ????豸???????????????????????????????
????b?????????BIOS???????????????????????????
????c?????CPU????????????????????????????????????????????????
????d????????а?????Щ???????豸???磺????CD-ROM???????????н?????н??
????e?????????????а??????弴????豸?????Щ?豸?????ж??DMA????????洢?????????????????????????????I/O???????
????4.2????ESCD??Extended System Configuration Data??????????????????
????ESCD??BIOS ???????????豸???????????BIOS??????????????????????????????????????CMOS?С?????????ESCD?л???????????????????????????????????????????????????????????
????4.3 ???????????
????BIOS????????CMOS???????????????????????????????????BootSector????????????????????????λ??????????????????棬?????????????????? ????????????з???????????????????????????????