文档介绍：Phoenix BIOS Release Post Codes
Note - If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional word-bitmap (xxxx) indicating the address line or bits that failed. For example, '2C 0002' means address line 1 (bit one set) has failed. '2E 1020' means data bits 12 and 5 (bits 12 and 5 set) have failed in the lower 16 bits. Note that error 30 cannot occur on 386SX systems because they have a 16 rather than 32-bit bus. The BIOS also sends the bitmap to the port-80 LED display. It first displays the checkpoint code, followed by a delay, the high-order byte, another delay, and then the low-order byte of the error. It repeats this sequence continuously.
02 - Verify Real Mode
03 - Disable Non-Maskable Interrupt (NMI)
04 - Get CPU type
06 - Initialize system hardware
07 - Disable shadow and execute code from the ROM.
08 - Initialize chipset with initial POST values
09 - Set IN POST flag
0A - Initialize CPU registers
0B - Enable CPU cache
0C - Initialize caches to initial POST values
0E - Initialize I/ponent
0F - Initialize the local bus IDE
10 - Initialize Power Management
11 - Load alternate registers with initial POST values
12 - Restore CPU control word during warm boot
13 - Initialize PCI Bus Mastering devices
14 - Initialize keyboard controller
16 - BIOS ROM checksum
17 - Initialize cache before memory Auto size
18 - 8254 timer initialization
1A - 8237 DMA controller initialization
1C - Reset Programmable Interrupt Controller
20 - Test DRAM refresh
22 - Test 8742 Keyboard Controller
24 - Set ES segment register to 4 GB
28 - Auto size DRAM
29 - Initialize POST Memory Manager
2A - Clear 512 kB base RAM
2C - RAM failure on address line xxxx*
2E - RAM failure on data bits xxxx* of low byte of memory bus
2F - Enable cache before system BIOS shadow
32 - Test CPU bus-clock frequency
33 - Initialize Phoenix Dispatch Manager
36 - Warm start shut down
38 - Shadow system