Intel SC450NX Product Guide - Page 131

Table 30. Port-80 Codes (continued) Normal Port 80 Codes Beeps Error 0E Initialize I/O 0F Initialize the local bus IDE 10 Initialize Power Management 11 Load alternate registers with initial POST valuesnew 12 Restore processor control word during warm boot 14 Initialize keyboard controller 16 1-2-2-3 BIOS ROM checksum 18 8254 timer initialization 1A 8237 DMA controller initialization 1C Reset Programmable Interrupt Controller 20 1-3-1-1 Test DRAM refresh 22 1-3-1-3 Test 8742 Keyboard Controller 24 Set ES segment register to 4GB 28 1-3-3-1 Autosize DRAM 2A Clear 512K base RAM 2C 1-3-4-1 RAM failure on address line xxxx* 2E 1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus 30 1-4-1-1 RAM failure on data bits xxxx* of high byte of memory bus 32 Test processor bus-clock frequency 34 Test CMOS 35 RAM Initialize alternate chipset registers 36 Warm start shut down 37 Reinitialize the chipset (MB only) 38 Shadow system BIOS ROM 39 Reinitialize the cache (MB only) 3A Autosize cache 3C Configure advanced chipset registers 3D Load alternate registers with CMOS valuesnew 40 Set Initial processor speed new 42 Initialize interrupt vectors 44 Initialize BIOS interrupts 46 2-1-2-3 Check ROM copyright notice 47 Initialize manager for PCI Option ROMs 48 Check video configuration against CMOS 49 Initialize PCI bus and devices 4A Initialize all video adapters in system 4B Display QuietBoot screen 4C Shadow video BIOS ROM continued 131