Inside Macintosh: Devices /

Chapter 3 - SCSI Manager / SCSI Manager Reference

SCSI Manager Routines /

SCSIMsgOut

You can use the SCSIMsgOut function to send a message to a SCSI device.

FUNCTION SCSIMsgOut (message: Integer): OSErr;

message

The low-order byte contains the message to be sent to the target device.

DESCRIPTION

The SCSIMsgOut function sends a SCSI message to the previously selected target device. The message is contained in the low-order byte of the message parameter. See the SCSI specification for information about the types of messages that can be sent from an initiator to a target.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for SCSIMsgOut are

Trap macro	Selector
_SCSIDispatch	$000D

RESULT CODES

noErr	0	No error
scCommErr	2	Communications error, operation timeout
scPhaseErr	X	Phase error on the SCSI bus

SEE ALSO

See "SCSI Messages," beginning on page 3-7, for an overview of SCSI messages. Refer to the SCSI specification for detailed information about SCSI messages.