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Inside Macintosh: Devices /

Chapter 2 - Slot Manager / Slot Manager Reference

Slot Manager Routines / Determining the Version of the Slot Manager

SVersion

You can use the SVersion function to determine which version of the Slot Manager is in use by the Macintosh Operating System.

FUNCTION SVersion (spBlkPtr: SpBlockPtr): OSErr;

spBlkPtr

A pointer to a Slot Manager parameter block.

<--	spResult	LongInt	The Slot Manager version number.
<--	spsPointer	Ptr	A pointer to additional information.

DESCRIPTION

The SVersion function returns the version number of the Slot Manager in the spResult field of the Slot Manager parameter block that you point to in the spBlkPtr parameter. Version number 1 corresponds to the RAM-based Slot Manager and version number 2 corresponds to the ROM-based Slot Manager. Versions of the Slot Manager prior to System 7 do not recognize the SVersion function and return the result code smSelOOBErr. The spsPointer field is reserved for future use as a pointer to additional information.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SVersion function are

Trap macro	Selector
_SlotManager	$0008

You must set up register D0 with the routine selector and register A0 with the address of the Slot Manager parameter block. When _SlotManager returns, register D0 contains the result code.

Registers on entry
A0	Address of the parameter block
D0	$0008

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
smSelOOBErr	-338	Selector out of bounds or function not implemented

SEE ALSO

For more information on the different versions of the Slot Manager, see "About the Slot Manager" on page 2-15.