Microsoft KB Archive/37924

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Mac DOS: Description of the TOPS FlashCard for the PC

Article ID: 37924

Article Last Modified on 10/30/2006


  • Microsoft Mail for Appletalk Networks 3.0
  • Microsoft Mail for Appletalk Networks 3.1

This article was previously published under Q37924


The following is a description of the TOPS FlashCard for the PC, which is available from Sun Microsystems, Inc. For more information on the TOPS FlashCard, call Sitka Technical Support at (415) 549-8737.


The following are the system requirements for the TOPS FlashCard:

  • IBM-compatible computer
  • MS-DOS version 2.00 or later

The TOPS FlashCard has six jumpers that can be used to change the board's I/O address, IRQ line, and DMA channel. The following diagram shows the relative position of the jumpers on the TOPS FlashCard (where X denotes the default jumper position):

   |                                    |
   |  Ja1                               |
   |  X H                               |
   |  : L                               |
   |                                    |
   |  Ja2   Ja3         Jint  Jd2  Jd1  |
   |  X :   : X         : X   X :  X :  |
   |  L H   L H         3 2   1 3  1 3  |

   Jumper Description       Default
   ------------------       -------

   Jint   Interrupt            2
   Jd1    DMA Acknowledge      1
   Jd2    DMA Request          1
   Ja1    I/O Address(398)    High
   Ja2    I/O Address         Low
   Ja3    I/O Address         High

The AppleTalk driver used by the TOPS FlashCard to communicate with the AppleTalk network depends on the version of TOPS/DOS software being used. TOPS/DOS version 2.0 uses the ATALK.SYS driver, which must by installed from the CONFIG.SYS file of the boot disk. TOPS/DOS versions 2.1 and 3.0 uses the ALAP.EXE driver, which can be installed from the AUTOEXEC.BAT file of the boot disk or the DOS prompt. For more information on these drivers, query on the following words in the Microsoft Knowledge Base:

TOPS and drivers and Mail

Both drivers can use the following switch settings for custom installations that are different from the default settings of the FlashCard. If there are no changes from the default jumper settings, no switches should be used. The /FLASHTALK option allows two FlashCards to communicate at high speeds, and is not required for running the Microsoft Mail MS-DOS client. The following is a list of available options:

 Option         Default       Other Possible Values

   /BOARDINT=x        2                  3
   /DMA=x             1           3 (AT only), none
   /ADDRESS=xxx     398               390,310
   /INT=xx           5C         Any unused interrupt (5C-6F)
   /FLASHTALK=x   Enabled(1)         Disabled(0)

The default factory settings for the TOPS FlashCard for the PC use interrupt 2, which conflicts with the hard disk controller of an IBM PC/AT or compatible computer. When you run the Mail MS-DOS client with the TOPS FlashCard, it is recommended that you set the board interrupt to 3 and the software interrupt to 60. With these suggested settings, the command to load the AppleTalk driver for the TOPS FlashCard should include the /boardint=3 and /int=60 switches.

TOPS FlashCard for the PC is manufactured by Sun Microsystems, Inc., a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Additional query words: 3.00 3.10 PC AppleTalk

Keywords: KB37924