Intel AN430TX User Manual

Page 28

AN430TX SPECIFICATION UPDATE

There are several POST routines that issue a POST Terminal Error and shut down the system if they fail.
Before shutting down the system, the terminal-error handler issues a beep code signifying the test point error,
writes the error to I/O port 80h, attempts to initialize the video and writes the error in the upper left corner of
the screen (using both mono and color adapters).

If POST completes normally, the BIOS issues one short beep before passing control to the operating system.

Table 43.

BIOS Beep Codes

Beeps

Port 80h Code

Explanation

1-2-2-3

16h

BIOS ROM checksum

1-3-1-1

20h

Test DRAM refresh

1-3-1-3

22h

Test 8742 Keyboard Controller

1-3-3-1

28h

Autosize DRAM

1-3-3-2

29h

Initialize POST Memory Manager

1-3-3-3

2Ah

Clear 512 KB base RAM

1-3-4-1

2Ch

RAM failure on address line xxxx

1-3-4-3

2Eh

RAM failure on data bits xxxx of low byte of memory bus

1-4-1-1

30h

RAM failure on data bits xxxx of high byte of memory bus

2-1-2-2

45h

POST device initialization

2-1-2-3

46h

Check ROM copy right notice

2-2-3-1

58h

Test for unexpected interrupts

2-2-4-1

5Ch

Test RAM between 512 and 640 KB

1-2

98h

Search for option ROMs. One long, two short beeps on checksum failure

13.

Revision of Section 3.1.4, PCI IDE Support

This section will be replaced in its entirety as follows:

If you select “Auto” in Setup, the BIOS automatically sets up the two local bus IDE connectors with
independent I/O channel support. The IDE interface supports hard drives up to PIO Mode 4 and recognizes
any ATAPI devices, including CD-ROM drives, tape drives and Ultra DMA drives (see Section 5.1 for the
supported version of ATAPI). Add-in ISA IDE controllers are not supported. The BIOS determines the
capabilities of each drive and configures them to optimize capacity and performance. To take advantage of
the high capacities typically available today, hard drives are automatically configured for Logical Block
Addressing (LBA) and to PIO Mode 3 or 4, depending on the capability of the drive. You can override the
auto-configuration options by specifying manual configuration in Setup. The ATAPI Specification
recommends that ATAPI devices be configured as shown in Table 41.