int apm_driver_version (u_short * val);
Retrieve the APM version supported by the BIOS. This is only supported for APM 1.1 or higher. An error indicates APM 1.0 is probably present.
On entry val should point to a value indicating the APM driver version with the high byte being the major and the low byte the minor number both in BCD
On return it will hold the BIOS revision supported in the same format.