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3-12
Chapter 3: Software Installation - QNX 2.XX
Echo
User's Manual, ver. 0.00
Figure 6:
QNX 2.XX: switch settings
Reserved - must be OFF
Base address sets:
Port 1 = address 280 hex
Port 2 = address 288 hex
Status port address
Status port is disabled
IRQ channel(s)
IRQ line for all ports is on channel A
SW1
Port 3 = address 290 hex
Port 4 = address 298 hex
Port 5 = address 2A0 hex
Port 6 = address 2A8 hex
Port 7 = address 2B0 hex
Port 8 = address 2B8 hex
In choosing an interrupt request line, you should note that QNX
vectors interrupt 3 and 4 to the serial handler. However, QNX
enables interrupt 4 only. If you are using interrupt 3, you will
have to use the following command to enable interrupt 3:
Example
stty inton=3
If you use an interrupt other than 3 or 4 you will need to use the
following commands:
Example
stty intcp=4,nn
stty inton=nn
where
nn
is the interrupt number to be used
Note:
Due to limitations in QNX 2.XX, only interrupts less than or
equal to IRQ 7 will work with standard serial port boards.