04 CPU verification; POST start 08 Shutdown condition 0; Shutdown byte 0 0C BIOS ROM checksum tested 10 CMOS ROM shutdown byte tested 14 DMA controller tested 18 System timer initialized 1C Memory refresh system tested 1E Memory type determined 20 Base 128K memory tested 24 8042 keyboard controller tested 28 CPU descriptor instruction tested 2C 8259 PIT tested 30 Temporary Interrupts located and initialized 34 BIOS Interrupt vectors and routines configured 38 CMOS RAM tested 3C Memory size determined 40 Shutdown condition 1 44 Video BIOS ROM initialized 45 RAM initialized and tested 46 Cache memory and controller initialized and tested 48 Memory tested 4C Shutdown condition 3 50 Shutdown condition 2 54 Shutdown condition 7 58 Shutdown condition 6 5C Keyboard and auxiliary I/O tested 60 BIOS Interrupt routines setup 64 RTC tested 68 Floppy drive and controller tested 6C Hard drive and controller tested 70 Parallel port tested 74 Serial port tested 78 Time of day setup 7C Optional ROM's searched for and started 80 Math coprocessor tested 84 Keyboard tested 88 System initialized 8C System initialized 90 Operating system boot process started 94 Shutdown condition 5 98 Shutdown condition A 9C Shutdown condition B