Legacy Document

Important: The information in this document is obsolete and should not be used for new development.

Chapter 2 - Slot Manager / Slot Manager Reference

SPtrToSlot
This function is used only by the Macintosh Operating System.
FUNCTION SPtrToSlot (spBlkPtr: SpBlockPtr): OSErr;
spBlkPtr
A pointer to a Slot Manager parameter block.

--> spsPointer Ptr A pointer to a byte in declaration ROM.
<-- spSlot SignedByte The slot number.

DESCRIPTION
The SPtrToSlot function returns the slot number of the card whose declaration ROM is pointed to by spsPointer. The value of spsPointer must have the form $Fsxx xxxx, where s is a slot number and x is a hexadecimal number.

ASSEMBLY-LANGUAGE INFORMATION
The trap macro and routine selector for the SPtrToSlot function are
Trap macro Selector
_SlotManager $002E

On entry, register D0 contains the routine selector and register A0 contains 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 $002E

Registers on exit
D0 Result code

RESULT CODES
noErr 0 No error
smUnExBusErr -308 A bus error occurred
smBadsPtrErr -346 Bad spsPointer value

Trap macro	Selector
_SlotManager	$002E

Registers on entry
A0	Address of the parameter block
D0	$002E

Registers on exit
D0	Result code

Shop the Apple Online Store (1-800-MY-APPLE), visit an Apple Retail Store, or find a reseller.

-->	`spsPointer`	`Ptr`	A pointer to a byte in declaration ROM.
<--	`spSlot`	`SignedByte`	The slot number.

noErr	0	No error
`smUnExBusErr`	-308	A bus error occurred
`smBadsPtrErr`	-346	Bad `spsPointer` value

Legacy Document

SPtrToSlot

DESCRIPTION

ASSEMBLY-LANGUAGE INFORMATION

RESULT CODES noErr0No error smUnExBusErr-308A bus error occurred smBadsPtrErr-346Bad spsPointer value

RESULT CODES
noErr 0 No error
`smUnExBusErr` -308 A bus error occurred
`smBadsPtrErr` -346 Bad `spsPointer` value