Routines
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A0F7: Fetch Object Pointer From Stack
Used by the routines at ProcessTextTokenStream, CheckObjectInA036, ProcessCharacterDisplay, ProcessObjectPointer, HandlePopStack, FindCharacterScriptEntry, E17B and ProcessCharacterAttribute.
Input
IX Object pointer (on stack)
Output
IX Object pointer
HL Zero if object pointer was zero, otherwise preserved
This will be restored back into HL by the end of the routine.
FetchObjectPointerFromStack A0F7 PUSH HL Stash HL on the stack temporarily.
A0F8 LD L,(IX-$02) L=*IX-02.
A0FB LD H,(IX-$01) H=*IX-01.
A0FE LD A,L Is HL zero?
A0FF OR H
Pretty clever way of using the stack here.
A100 EX (SP),HL Swap the *SP with the object pointer, restoring HL to the original value.
A101 POP IX Restore the object pointer into IX (from the stack).
A103 RET Return.
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