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SYMPTOM POSSIBLE REMEDY
• In general, IRQ4 belongs to COM1.
IRQ3 belongs to COM2. COM3 and
COM4 can be set to IRQ5-7, 10-12, or
11-15. It is best to put an interrupt-
driven device on COM1 or 2 (e.g., a
mouse).
• The IRQ settings in your software must
match the settings in Windows 95
Device Manager.
• Verify that the external device is
capable of those speeds.
• Make sure the board is set to high-
speed mode with the J12 jumper.
• Check the Windows 98/95 Device
Manager and make sure the port is set
for high-speed by clicking “Boca IO
Adapter” in Device Manager. These
settings must not conflict with any
other hardware.
• The diagnostics program used must be
capable of testing 650 UARTS. Most
diagnostics programs can test only 450
and 550 UARTs.
I am not sure how toI am not sure how to
I am not sure how toI am not sure how to
I am not sure how to
set the IRQs.set the IRQs.
set the IRQs.set the IRQs.
set the IRQs.
No response whenNo response when
No response whenNo response when
No response when
working at speedsworking at speeds
working at speedsworking at speeds
working at speeds
exceeding 1exceeding 1
exceeding 1exceeding 1
exceeding 1
15Kbps.15Kbps.
15Kbps.15Kbps.
15Kbps.
The board will notThe board will not
The board will notThe board will not
The board will not
work in high-speedwork in high-speed
work in high-speedwork in high-speed
work in high-speed
mode.mode.
mode.mode.
mode.
Diagnostic programsDiagnostic programs
Diagnostic programsDiagnostic programs
Diagnostic programs
such as Checkitsuch as Checkit
such as Checkitsuch as Checkit
such as Checkit
report failures onreport failures on
report failures onreport failures on
report failures on
serial ports or wrongserial ports or wrong
serial ports or wrongserial ports or wrong
serial ports or wrong
UARUAR
UARUAR
UAR
T speed.T speed.
T speed.T speed.
T speed.
Troubleshooting
9361.p65 2/11/99, 11:02 AM29