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Inside Macintosh: Devices /

Chapter 3 - SCSI Manager / SCSI Manager Reference

SCSI Manager Routines /

SCSIMsgIn

You can use the SCSIMsgIn function to receive a message from a SCSI device.

FUNCTION SCSIMsgIn (VAR message: Integer): OSErr;

message

The low-order byte contains the message from the target device.

DESCRIPTION

The SCSIMsgIn function receives a SCSI message from the previously selected target device. The message is returned 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 a target to an initiator.

The SCSIMsgIn function leaves the attention bus signal undisturbed if it is already asserted.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for SCSIMsgIn are

Trap macro	Selector
_SCSIDispatch	$000C

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.