8.15: Why do I get errors when trying to access the (modem/serial) port?
Description
This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
8.15: Why do I get errors when trying to access the (modem/serial) port?
A#8.15: This is usually caused by serial port configuration problems.
Common symptoms may be:
% copycat .ttyco .ttya
Error opening tty .ttya, aborting.
or
% /usr/sbin/getty 8bit.38400 .ttya
getty: .ttya: I/O error
The first thing to check is that the following GNO serial port
drivers exist:
/dev/modem
/dev/printer
Next, ensure the following two lines are in your /etc/tty.config
file, and that they are uncommented:
modem 2 .ttya
printer 1 .ttyb
Finally, ensure that SIM (the Serial Interrupt Manager) is present
and active. This is an init in your system.setup directory:
*/system/system.setup/sim
Remember to reboot your system if you've made any changes in
or to comply with the above requirements.
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