|All other registers dependent on reason code|
The purpose of this call is to provide an interface that allows the full capacity of a machines NVRAM (aka CMOS RAM) to be accessed. Other calls (OS_Byte 161, OS_Byte 162) are limited in that they only provide access to the first 240 bytes of NVRAM.
The action performed depends on the reason code value in R0.
|0||&00||Read NVMRAM size|
|1||&01||Read a byte|
|2||&02||Write a byte|
|6||&06||Read default value used on CMOS reset|