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:
BIOS
IRDY
OSC
FRAME
RST
12V
-12V
5V
-5V
3V3
Motherboard Clock Signal.
Should be on when power is supplied to the
motherboard even without CPU.
BIOS Read Signal. Flashes when CPU reads BIOS code.
Device Ready. Flashes when an IRDY signal is detected.
ISA Oscillation Indicator. Indicate ISA Oscillation Signal is available.
PCI Bus Frame. Should be on under normal circumstances and flashes
when a PCI Frame Signal is detected.
Reset. After power on or reset, this indicator should be on for an half
second and then turned off.
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
is a short circuit.
Power Supply, 5-Volt Positive. Should be on all the time otherwise there is
a short circuit.
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
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.
Connect the second display by flat cable
Connect the build-in speaker and motherboard with speaker cable
Power on the machine.
