The Question is:
I need to control some simple HW with a 4-bit parallel DC output signal. This
is easy enough on an PC's parallel port... but how can I do it on a DS10 with
Maybe I can use $QIOs to the printer driver?
Or maybe I'll end up having to write my own driver.... but then where does one
find HW programming info for this Pport on an alpha?
(or is it same as PC?)
The Answer is :
SYS$EXAMPLES:LRDRIVER.* is the source code for a parallel port
device driver, and can (obviously) be customized to meet local
requirements within the limitations of the available hardware.
Device control options can and do vary; the standard parallel
port driver does not particularly over this control. The serial
terminal driver can control modem signals via $qio[w], however.
Commercial options include packages such as the BASEstar
environment, and customized drivers for specific communications
and control hardware.
The Device Driver manual available from Digital Press may be
of some interest, as well. This book presents details on
writing OpenVMS Device Drivers in C.