=> R0 = Bits 0..7 Device ID
Bits 24..25 00 => no data transfer, 01 => read, 10 => write, 11 => reserved
Bit 26 Scatter Bit, if set, R3 is a pointer to a scatter list.
Bit 27 If clear, poll escape during transfer and abort if escape pressed
Bit 28 If set, repeatedly retry on timeout
Bit 29 Set if a background transfer (possibly 0 length).
R1 = Length of SCSI control block
R2 = Ptr to SCSI control block
R3 = RAM ptr for start of transfer or pointer to scatter list of address length
pairs if Bit 26 of R0 is set. After each chunk in the scatter list is
transferred the address should be incremented and the length set to 0.
R4 = Length of transfer (in bytes).
R5 = Timeout in centiseconds or 0 for default timeout
R6 = Address to call back when transfer is complete if background Bit set.
The call is made in IRQ mode with IRQs disabled.
If an error has occurred, V is set, R0 points to a non-dynamic error
block, (ie a pointer to a fixed block in the module rather than built
up in a buffer), R1 indicates the cause of the error and R2 the logical
address on the device of where the error occured.
R7 = Workspace pointer to pass in R12 for background call back.
R8 = access key
=> V clear
R0 = returns a 32 Bit id incremented for each operation. Used to cancel op.
R3 = updated to indicate how much of transfer was successful (if scatter list, pointer to first unused/partially used entry).
R4 = updated to the amount untransferred
=> V set
R0 = points to an error block
R1 = indicates the cause of the error
R2 = hold the logical address on the device of where the error occured.
R3 = updated to indicate how much of transfer was successful (if scatter
list, points to first unused entry, entry is updated to indicate amount
transfered).
R4 = updated to the amount untransferred
This SWI issues a SCSI command to a device and can be called in the background.
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