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Inside Macintosh: Operating System Utilities /
Chapter 9 - Start Manager / Start Manager Reference
Data Structures

The Default Operating System Parameter Block

Two procedures, GetDefaultOS and SetDefaultOS, use the default operating system parameter block. You can use these procedures with the default operating system parameter block to get or set the default operating system. The DefOSRec data type defines the default operating system parameter block.

TYPE  DefOSRec = 
RECORD
   sdReserved: SignedByte; {reserved}
   sdOSType:   SignedByte; {operating-system type}
END;
DefOSPtr = ^DefOSRec;
Field Description
sdReserved
Reserved.
sdOSType
A value identifying the operating system installed at startup. A 1 indicates the Macintosh Operating System. The numbers 0 through 15 are reserved.
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© Apple Computer, Inc.
6 JUL 1996