Title: Intellicon Serial I/O Qnx4.22 Jerky Mouse Operation
Keywords: Mouse, Intelligent, cards, Intellicon, NT960
Date: March 25, 1997
Concerning Intellicon Serial Adapters
A customer has problems with the mouse under QNX 4.22. Seems that the
card is buffering mouse events. If the customer is moving the mouse, the
movement of the mouse cursor on the screen is very jerky.
What is the best configuration for a mouse?
It is not recommended that a mouse be connected to an Intelligent card,
due to the fact that the card buffers data. It is recommended that you
use a dumb port serial port with the FIFO disabled.
There are some options that might help, try Connect Tech’s ctty utility for example:
ctty -rxtimers < /dev/cti1, or even try
ctty -rxtimers rxthreshold=1 < /dev/cti1
These options will tell the Intellicon to immediatley Interrupt QNX
whenever data is avialable (-rxtimer), and to interrupt when there
is at least one character available (rxthreshold=1). We’re not to
sure about rxthreshold, but rxtimer might do the job all by itself.
The buffer and flow control should be left where they are.
End of KDB-162