Acer Aspire 8940G Acer Aspire 8940 Service Guide - Page 216

Code C1h C2h C3h C4h C5h C6h C7h C8h C9h D2h Beeps POST Routine Description Initialize POST Error Manager (PEM) Initialize error logging Initialize error display function Initialize system error handler PnPnd dual CMOS (optional) Initialize notebook docking (optional) Initialize notebook docking late Force check (optional) Extended checksum (optional) Unknown interrupt Code Beeps For Boot Block in Flash ROM E0h Initialize the chipset E1h Initialize the bridge 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 F3h F4h 1 Initialize video Initialize System Management Mode Output one beep before boot F5h Boot to Mini DOS F6h Clear Huge Segment F7h Boot to Full DOS * 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. 206 Chapter 4