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Across the Boards

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Communications Device Drivers

Section 5 - General Configuration and Usage Information

Page 203

cfSOFTWARE Confidential,

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2000

5.15 CFXSWTC

- ATB/DOS Extended DOS Driver Support

Some ATB/DOS drivers are implemented as extended DOS applications. These drivers require special support

by the application to get the extended DOS environment loaded.

To use an extended mode driver the application load sequence should be changed from:

program parm1 parm2...

to:

cfxswtc cfx????.dll c:\dir\program.exe parm1 parm2...

CFXSWTC.EXE will load the

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Extended DOS environment and the

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driver

indicated, and then shells to the application program.

NOTE

: The application program must be specified via the full file name, and that the system path will

not

be searched. (Therefore, the program name should be fully qualified if the program is not in the

current directory.)

The current release of CFXSWTC.EXE has the following limitations:

- A DPMI host is required

- The result code of the application program is not passed through

When calling the extended mode driver, ATB/DOS will use a special translation driver (CFXDXDT.DDL) to

pass calls from the real mode XAPI to the extended mode driver. This driver must be in the normal

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Boards

search chain.

Other than the pre-load/shell step, the use of an extended mode

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driver is transparent to the

application.

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Eicon Networks CX1 Spezifikationen Seite 53