Compaq Mega-Post manual Users Guide Power On Self-Test Post Codes, PCI Signal Definition

User's Guide

Power On Self-Test (POST) Codes

Most AT and 386 computers (and a few XT computers) output status codes during POST. The

Diagnostic Card displays these codes during and after POST. Refer to Appendix A for a comprehensive listing of POST codes provided by BIOS manufacturers.

PCI Signal Definition:

CLK	Motherboard Clock Signal. Should be on when power is supplied to the
	motherboard even without CPU.
BIOS	BIOS Read Signal. Flashes when CPU reads BIOS code.
IRDY	Device Ready. Flashes when an IRDY signal is detected.
OSC	ISA Oscillation Indicator. Indicate ISA Oscillation Signal is available.
FRAME	PCI Bus Frame. Should be on under normal circumstances and flashes
	when a PCI Frame Signal is detected.
RST	Reset. After power on or reset, this indicator should be on for an half
	second and then turned off.
12V	Power Supply, 12-Volt Positive. Should be on all the time otherwise there
	is a short circuit.
-12V	Power Supply, 12-Volt Negative. Should be on all the time otherwise there
	is a short circuit.
5V	Power Supply, 5-Volt Positive. Should be on all the time otherwise there is
	a short circuit.
-5V	Power Supply, 5-Volt Negative. Should be on all the time otherwise there
	is a short circuit.
3V3	Power Supply, 3.3-Volt.Some motherboards have 3.3V power supply to
	PCI slots. This indicator should be on if the motherboard supplies 3.3V
	power.

Installing the Mega-Post PCI-Diagnostic Card

Installation Procedure

TO INSTALL A Diagnostic Card:

1)Install the Diagnostic Card in any available PCI or ISA expansion slot.

2)Connect the second display by flat cable

3)Connect the build-in speaker and motherboard with speaker cable

4)Power on the machine.

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