MS400.1
Carrying out the change:
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Example will use COM2 as a multipurpose port and COM 3,4,5 for BBS.


1.  Referring to your MS-400 booklet, set the address dip switches (SW1)
    for the lowest port you want to use.  Example: COM2 (off off on).

2.  Set the dip switches that select the IRQ lines for the multipurpose
    ports ONLY!!  COM1 uses IRQ4, COM2 uses IRQ3.  Example: SW2 #2 is on
    while all the rest are off.

3.  Turn over the card to the side without the parts and locate the
    pins that correspond to the dip switches SW2 and SW3.

4.  For each BBS only port, solder a diode across the DIP switch
    position that corresponds to IRQ2.  The cathode should be away
    from the edge connector.  The diode makes the path that the switch
    would have.  One way to find the exact position is to turn on IRQ2
    for all the BBS ports and test for the proper pins with an ohm
    meter.  Solder the diodes in place and then TURN OFF the IRQ2
    switches.
CONTINUED IN FILE MS400.3