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Inside Macintosh: Devices /

Chapter 3 - SCSI Manager / SCSI Manager Reference

SCSI Manager Routines /

SCSIWBlind

You can use the SCSIWBlind function to write to a SCSI device using a blind transfer.

FUNCTION SCSIWBlind (tibPtr: Ptr): OSErr;

tibPtr

A pointer to an array of TIB instructions.

DESCRIPTION

The SCSIWBlind function is identical to the SCSIWrite function but does not poll the SCSI controller before transferring each byte of data. The SCSI controller is polled only for the first byte transferred by each scInc, scNoInc, or scComp TIB instruction.

SPECIAL CONSIDERATIONS

You should use this function only if the device you are writing to is capable of accepting data fast enough to avoid timeout errors from the SCSI controller.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for SCSIWBlind are

Trap macro	Selector
_SCSIDispatch	$0009

RESULT CODES

noErr	0	No error
scCommErr	2	Communications error, operation timeout
scBadParmsErr	4	Unrecognized TIB instruction
scPhaseErr	X	Phase error on the SCSI bus
scBusTOErr	9	Bus timeout during blind transfer

SEE ALSO

See the description of the SCSIWrite function on page 3-38 for information about performing a polled transfer. See "Choosing Polled or Blind Transfers," beginning on page 3-22, for additional information.