pckbc —
PC (ISA) keyboard controller driver
pckbc* at acpi?
pckbc* at isa?
pckbc* at pnpbios? index ?
pckbd* at pckbc? slot ?
pms* at pckbc? slot ?
The pckbc driver handles resource allocation and device
  attachment for the traditional PC/AT keyboard controller. It provides two
  logical connections for child devices, the “keyboard” slot for a
  keyboard and the “auxiliary” slot for mice (the latter might be
  missing in older keyboard controllers).
The optional “slot” locator argument can be used to
    force unusual connections of devices to logical slots. This feature is for
    experimentation only, it will not be useful in normal operation.