Inside Macintosh: Processes

Chapter 4 - Vertical Retrace Manager / Vertical Retrace Manager Reference

Vertical Retrace Manager Routines / Utility Routines

AttachVBL

The AttachVBL function changes the slot number of the primary video monitor.

FUNCTION AttachVBL (theSlot: Integer): OSErr;

theSlot

The new slot number for the primary video monitor.

DESCRIPTION

The AttachVBL function changes the slot number of the primary monitor to the number specified by the theSlot parameter. System software uses this routine to ensure correct cursor updating.

ASSEMBLY-LANGUAGE INFORMATION

The registers on entry and exit for AttachVBL are

Registers on entry
D0	Slot number

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
slotNumErr	-360	Invalid slot number