Acer AC4B SM50 KB.I140A.015 用户手册

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Chapter 4

* 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 check point 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.

E2h

Initialize the CPU

E3h

Initialize system timer

E4h

Initialize system I/O

E5h

Check force recovery boot

E6h

Checksum BIOS ROM

E7h

Go to BIOS

E8h

Set Huge Segment

E9h

Initialize Multi Processor

EAh

Initialize OEM special code

EBh

Initialize PIC and DMA

ECh

Initialize Memory type

EDh

Initialize Memory size

EEh

Shadow Boot Block

EFh

System memory test

F0h

Initialize interrupt vectors

F1h

Initialize Run Time Clock

F2h

Initialize video

F3h

Initialize System Management Mode

F4h

1

Output one beep before boot

F5h

Boot to Mini DOS

F6h

Clear Huge Segment

F7h

Boot to Full DOS