Routines
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7F6F: Find the previous frame (24 bytes higher)
Returns IX = IY + 24: the frame before the current one in parse order, skipping ALL EXCEPT exception frames (bit 6 of byte 1). The entry at 7F73 is shared with 7F69, which uses -24 instead.
7F6F PUSH DE
7F70 LD DE,$0018 Step +24: the previous frame
This entry point is used by the routine at 7F69.
7F73 PUSH IY IX = IY...
7F75 POP IX
7F77 ADD IX,DE ...plus the step
7F79 BIT 6,(IX+$01) Is this an exception frame (bit 6)?
7F7D JR NZ,$7F77 Yes: skip over it
7F7F POP DE
7F80 RET
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