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Inside Macintosh: Devices /

Chapter 3 - SCSI Manager / SCSI Manager Reference

SCSI Manager TIB Instructions /

scLoop

You can use the scLoop TIB instruction to repeat a sequence of TIB instructions a specified number of times.

-->	scParam1	LongInt	The relative offset of the TIB instruction to branch to.
-->	scParam2	LongInt	The number of times to loop.

DESCRIPTION

The scLoop TIB instruction decrements the value in scParam2 by 1. If the result is greater than 0, the flow of control branches to the TIB instruction whose relative offset is the current instruction plus the value in scParam1. If the result is 0, control passes to the instruction following the scLoop instruction. The offset in scParam1 is a signed value, and must be a multiple of 10 bytes (the size of the SCSIInstr data type). For example, to branch to the instruction immediately preceding the current one, you would specify a relative offset of -10. To jump ahead three instructions, you would specify a relative offset of 30.