=> R2 = address of alternative hard disc controller
R3 = address of poll location for IRQ/DRQ
R4 = bits for IRQ/DRQ
R5 = address to enable IRQ/DRQ
R6 = bits to enable IRQ/DRQ
This call sets up the address of the ST506 hard disc controller to be used by the ADFS. For instance, an expansion card can supply an alternative controller to the one normally used. The controller must be an HD63463 (or compatible).
The polling and interrupt sense is done using:
LDRB Rn,[poll location]
TST Rn,[poll bits]
The IRQ/DRQ must be 1 when active.
See PRM 2, page 280.
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