Mac DOS: Installing a LocalTalk Compatible Card in an IBM PC/XT (39483)


The information in this article applies to:

  • Microsoft Mail for AppleTalk Networks, MS-DOS workstation 1.37
  • Microsoft Mail for AppleTalk Networks, MS-DOS workstation 2.0
  • Microsoft Mail for AppleTalk Networks, MS-DOS workstation 3.0
This article was previously published under Q39483

SUMMARY

The IBM PC/XT or a PC/XT compatible uses interrupt 5 for the hard disk controller. To avoid conflicts, no devices installed in an XT should use interrupt 5. To reduce the possiblity of conflicts between other applications and software drivers, set the DMA (direct memory access) channel to 1; note also that the software interrupt should be located at address 60.

MORE INFORMATION

The following table shows some of the common devices that might be installed in an XT, the interrupts used by these devices (in brackets []), and the possible interrupt settings for the Farallon LocalTalk card or compatible cards: 
Net Card  Mouse    COM1  COM2    Possible PC LocalTalk Card Settings
--------  -----    ----  ----    -----------------------------------

[2]       [2,3,4]  [4]   [3]

No        No       No    No      Interrupt = 2, 3, or 4

No        No       Yes   No      Interrupt = 2 or 3

No        Yes      Yes   No      Interrupt = 3 with mouse interrupt=2
                                 Interrupt = 2 with mouse interrupt=3

No        Yes      Yes   Yes     Interrupt = 2 requires disabling mouse
                                 Interrupt = 3 requires disabling COM2

Yes       No       No    No      Interrupt = 3 or 4

Yes       No       Yes   No      Interrupt = 3

Yes       Yes      Yes   No      Interrupt = 3 requires disabling mouse
                                 Interrupt = 4 requires disabling COM1

Yes       No       Yes   Yes     Interrupt = 2 requires disabling net
                                               card
                                 Interrupt = 3 requires disabling COM2
                                 Interrupt = 4 requires disabling COM1
                                               and COM2

Yes       Yes      No     No     Interrupt = 3 with mouse interrupt=4
                                 Interrupt = 4 with mouse interrupt=3
If you still encounter problems installing your Farallon LocalTalk card, call Farallon Technical Support at (415) 596-5000.
Modification Type:MajorLast Reviewed:5/20/2003
Keywords:KB39483
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