Post Tests - HP Vectra VE4 Reference Manual

POST Tests

This section describes the power-on self tests which are automatically performed when the
system is powered-on or reset. The tests are described in the order in which the system
performs them.
System BIOS Tests
Test
LED
Processor
System (BIOS) ROM
RAM Refresh Timer
Interrupt RAM
Shadow System ROM BIOS
CMOS RAM
Internal Cache Memory
Video Tests
Test
Video Initialization
System Board Tests
Test
External Cache
8042 (Self-Test)
Vectra 4E/xx Technical Reference
Purpose
Tests the LEDs on the control panel.
Tests the processor's registers. Test failure causes the
boot process to stop.
Calculates an 8-bit checksum. Test failure causes the
boot process to stop.
Tests the RAM refresh timer circuitry. Test failure
causes the boot process to stop.
Tests for RAM parity errors.
Checks the first 64 KB of system RAM used to store
data corresponding to various system interrupt
vector addresses.
Test failures cause the boot process to stop.
Tests the system ROM BIOS and shadows it. Failure to
shadow the ROM BIOS will cause an error code to be
displayed. The boot process will continue, but the
system will execute from ROM. This test is not
performed after a soft reset (using [CTRL] [ALT] and
[DELETE]).
Checks the CMOS RAM for start-up power loss,
verifies the CMOS RAM checksum(s). Test failure
causes error codes to be displayed.
Tests the processor's internal level-one cache RAM.
Test failure causes an error code to be displayed and
the boot process to stop.
Purpose
Initializes the video subsystem, tests the video shadow RAM,
and, if required, shadows the video BIOS. A failure causes an
error code to be displayed, but the boot process continues.
Purpose
Tests the level-two cache. A failure causes an error code to be
displayed and asks the user to acknowledge external cache
disabling.
Downloads the 8042 and invokes the 8042 internal self-test. A
failure causes an error code to be displayed.
4 System Hardware Tests 41