## Physical Device Driver Reference

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### Address Conversion Using DevHlp Services

To get a logical address to place in an ABIOS request block:

1.Call PhysToVirt with ES:DI for the converted address.
2.Store the converted address in the ABIOS request block.
3.Call the ABIOS service.

For more information on interfaces to specific ABIOS functions, refer to the Personal System/2 and Personal Computer BIOS Interface Technical Reference.