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32 .Nd PC (ISA) control port driver
36 .Cd "isabeep* at pcppi?"
38 .Cd "sysbeep* at pcppi?"
45 driver handles resource allocation and device attachment for the
46 ports related to the ISA speaker in the traditional PC/AT
49 .Dq system control port
50 (which was implemented by the 8255
52 in the XT, hence the name of this driver)
55 When associated with an
57 device, it is possible to change the pitch of the sounds emitted through
62 driver provides its child devices with the ability to output simple
63 tones through the PC speaker. The
67 devices use this to synthesize sounds.
72 devices are helpers which the
74 driver uses as a substitute for a
76 because the PC keyboard hardware doesn't provide this.