... plan; This article adopts the dot matrix LCD display technology, can show Chinese simplified, Chinese traditional, English fault information ... ,0x11 DMA channel 1, "test." ,0x12, "testing the DMA page registers." ,0x13, "test 8741 keyboard controller interface." ,0x14, "test ... function." ,0x23, "test protection way, the virtual way and page way." ,0x24, "more than 1Mb expanded memory test." ,0x25 ...