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PGS(4) Device Drivers Manual (macppc) PGS(4)

pgsprogrammer's switch

pgs* at macgpio?

The pgs driver provides support for the "Programmer's Switch" found on selected PowerMac2,1 and newer models. If the ddb.console sysctl(8) is set, pressing the button will cause the machine to enter ddb(4). The "Programmers Switch" can be identified by the V-like symbol on it.

intro(4), macgpio(4), sysctl(8)

Support for the pgs driver first appeared in OpenBSD 4.8.

The pgs driver was written by Jasper Lievisse Adriaanse <>.

July 16, 2013 OpenBSD-current