Internal Buffer Test; Receive Interrupt Test - M-Audio Portman 2x4 Manual

MIDI cable connected between the MIDI jacks of the PORTMAN.

3. Internal Buffer Test

Your PORTMAN 2x4 should never fail the Internal Buffer Test. This test
checks the PORTMAN's ability to handle the flow of data through its cir-
cuit and failure probably indicates a bad chip in the PORTMAN. If you
think this is the case, please contact MIDIMAN Product Support.

4. Receive Interrupt Test

This test checks the reception of data from the PORTMAN into the comput-
er's parallel port. This test, like the buffer test, should never fail. If it does,
there are a few things to check.
Most computers use IRQ 7 for LPT1 and IRQ 5 for LPT2. If you have the
PORTMAN connected to LPT1 on your computer and have I=7 set in
2X4DIAG.EXE, but it fails the Receive Interrupt Test, you could have a
computer with IRQ 5 assigned to LPT1. Try that in 2X4DIAG.EXE.
If you are unsure of what your port IRQ is or how to find out, please see
the section in this manual titled "About Your PC Port Address" (page 13),
or you can consult your computer owner's manual.
It is also possible that you have a computer that does not have an IRQ
attached to its parallel port. It may still be possible within Windows 98 or
95 to assign an IRQ by going to the Device Manager/Ports/Printer
Port/Resources and choosing a different "basic configuration." You may
be able to add an inexpensive add-on card to give this machine more LPT
ports if it is a desktop. It is also possible that the IRQ is disabled on your
parallel port and simply needs to be switched on. For information regard-
ing this, consult your computer owner's manual or computer manufacturer
directly.
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