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Inside Macintosh: Devices /

Chapter 3 - SCSI Manager / SCSI Manager Reference

SCSI Manager Routines /

SCSIRead

You can use the SCSIRead function to read data from a SCSI device using a polled transfer.

FUNCTION SCSIRead (tibPtr: Ptr): OSErr;

tibPtr

A pointer to an array of TIB instructions.

DESCRIPTION

The SCSIRead function reads data from the previously selected target device. The data transfer instructions are specified by the TIB array pointed to by the tibPtr parameter.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for SCSIRead are

Trap macro	Selector
_SCSIDispatch	$0005

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
scCompareErr	6	Comparison error from scComp instruction

SEE ALSO

See "Using CDB and TIB Structures," beginning on page 3-17, for information about using TIB instructions. See "SCSI Manager TIB Instructions," beginning on page 3-27, for details of the TIB instruction set.