PROM console interface
pcons0 at mainbus0
wsdisplay* at pcons?
device provides a simple text console,
using the PROM services for input and/or output if no other driver handles
this task. It will use the PROM console devices set via the
“input-device” and “output-device” variables.
This driver is provided as a fallback console mechanism if the real console
hardware cannot be driven in OpenBSD
support for the PROM console first appeared in
handles console input, the PROM will
handle break (or Stop-A) sequences before pcons
The preferred way to enter ddb(4)
on a ddb-enabled pcons console is then to enter the following sequence :