Legacy Document

Inside Macintosh: Operating System Utilities /

Chapter 9 - Start Manager / Start Manager Reference

Routines / Identifying and Setting the Default Video Device

SetVideoDefault

You can use the SetVideoDefault procedure to write information to parameter RAM that sets or changes the default video device.

PROCEDURE SetVideoDefault (paramBlock: DefVideoPtr);

paramBlock

A pointer to a default video device parameter block.

-->	sdSlot	SignedByte	Physical slot number.
-->	sdSResource	SignedByte	Slot resource ID (SResourceID).

DESCRIPTION

The SetVideoDefault procedure writes information to parameter RAM that sets or changes the default video device. If you set the sdSlot field to 0, indicating no default video device, the Start Manager chooses the first available video device when the computer starts up.

ASSEMBLY LANGUAGE INFORMATION

The registers on entry and exit for this routine are

Registers on entry
A0	Address of the default video device parameter block

Registers on exit
A0	Address of the default video device parameter block

SEE ALSO

For more information about the default video device parameter block see "The Default Video Device Parameter Block" beginning on page 9-19.

To retrieve information about the default video device, see the description of the GetVideoDefault procedure on page 9-23.