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1989-12-31
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Technical Advisory Note 001 13 July 1989 revised 30 December 1989
Vmos/3 COM ports
As of version 1.0g, COM ports are properly supported for most applications.
The Mode of the VDD determines how the COM port will be handled.
Please refer to page 6-2 in the Vmos/3 Reference Guide for an explanation of
VDD Modes.
In summary: For a mouse, use fOreground Mode. This ensures that the mouse
will be attached to the Session using the Foreground screen.
For a modem or other serial device, use Com Mode. This provides
the buffered UART support necessary under a task based operating
system like Vmos/3.
For proper operation of a COM Session in Background, change its Priority
to 20. Page 4-4 in the Vmos/3 Reference Guide discusses default assignments.
For example, to change the Priority for Session 2, type:
DOS Priority 2 20 <Enter>