=> R1 = &10800 (reason code)
R2 = address of current ST506 controller
R3 = address of IRQ status register for controller
R4 = AND mask - AND this with IRQ status reqister to give non-zero when IRQs are enabled
R5 = address of IRQ mask register for controller
R6 = OR mask - ORR this with IRQ mask register to enable IRQs.
<= preserve all registers to pass on, or
R1 = 0 (to claim)
R2 = address of new ST506 controller
R3 = address of IRQ status register for controller
R4 = AND mask
R5 = address of IRQ mask register for controller
R6 = OR mask
This service is issued by ADFS to allow a ST506 hard disc expansion card to use its hardware in place of the machine's built in hardware.
See PRM 4, page 135
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