M-AUDIO MIDISPORT 8x8/s - Manual (Page 39)

• Your computer’s serial port is configured incorrectly, is defective or disabled.
There may be an infrared function available for the serial port, and it is
enabled. You should disable the infrared function via the BIOS CMOS Setup
of your computer’s motherboard
2. Internal Buffers Test
This test verifies the MIDISPORT-to-host connection, as well as the
MIDISPORT’s internal MIDI data buffers. If it fails, it most often is due to one or
more of the following:
• Your serial cable is not compatible or is defective.
• Your computer’s serial port is configured incorrectly, is defective or disabled.
There may be an infrared function available for the serial port, and it is
enabled. You should disable the infrared function via the BIOS CMOS Setup
of your computer’s motherboard
• The MIDISPORT is defective. This is extremely rare as the MIDISPORT units
are tested rigorously at the factory before shipping. If you think this is the
case, please contact MIDIMAN Technical Support.
3. Transmit/Receive Test
This test verifies the MIDISPORT’s ability to transmit and receive MIDI data on
its ports. If it fails, it most often is due to one or more of the following:
• The loopback MIDI cable is incorrectly connected. Check to make sure that
you have a MIDI cable connected between the MIDISPORT MIDI In and the
MIDISPORT MIDI Out selected in the diagnostic program. There should be
no MIDI instruments, mergers, or thru boxes connected to the MIDISPORT
during this test; it is a closed-loop test with one MIDI cable connected
between two MIDI jacks of the BiPort.
• The MIDI cable you are using to loopback data is defective.
• The MIDISPORT is defective. This is extremely rare as the MIDISPORT units
are tested rigorously at the factory before shipping. If you think this is the
case, please contact MIDIMAN Technical Support.
4. Receive Interrupt Test
This test verifies the reception of data from the MIDISPORT under interrupt
(IRQ) control. If this test fails, it is host serial port related. More specifically it is
almost always host IRQ-related.
Most computers use IRQ4 for COM1 and IRQ3 for COM2. If you have the
MIDISPORT connected to COM1 on your computer and have IRQ=4 set in
MS88DIAG.EXE, but it fails the Receive Interrupt Test, you could have an
internal modem connected COM1 or another odd numbered COM port using
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