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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:
Motherboard Clock Signal. Should be on when power is supplied to the
CLK
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.
Power Supply, 12-Volt Negative. Should be on all the time otherwise there
-12V
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.
Power Supply, 3.3-Volt. Some motherboards have 3.3V power supply to
3V3
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.
3
User's Guide
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