
Across the Boards
Communications Device Drivers
Miscellaneous Topics
Page 361
cfSOFTWARE Confidential,
2000
Section 7 - Miscellaneous Topics
7.1 Rational Systems DOS Extender
This DOS extender has been used to implement ATB/DOS in a environment where the application is in
protected mode, and the ATB modules are loaded in real mode with a mode switch occuring under the
applications control. A problem is that Rational Systems DOS Extender makes the switch and leaves interrupts
disabled
. This causes the VTIC calibrate to hang. The application
must
insure that interrupts are enabled
before calling ATB modules.
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