Legacy Document

Inside Macintosh: Devices /

Chapter 2 - Slot Manager / Slot Manager Reference

Slot Manager Routines / Getting Information About Expansion Cards and Declaration ROMs

SCardChanged

You can use the SCardChanged function to determine if the card in a particular slot has been changed.

FUNCTION SCardChanged (spBlkPtr: SpBlockPtr): OSErr;

spBlkPtr

A pointer to a Slot Manager parameter block.

-->	spSlot	SignedByte	The slot number.
<--	spResult	LongInt	A Boolean signifying whether the card was changed.

DESCRIPTION

The SCardChanged function checks if the expansion card in a slot has been changed (that is, if the card's sPRAMInit record has been initialized). You specify the slot in the spSlot field of the Slot Manager parameter block you point to in the spBlkPtr parameter.

The SCardChanged function returns a value of TRUE in the spResult field of the parameter block if the card has been changed.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SCardChanged function are

Trap macro	Selector
_SlotManager	$0022

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	$0022

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
smEmptySlot	-300	No card in this slot