Routines
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7F5C: Parser: step on to the next frame
Decrements B, finds the next frame (7F69, 24 bytes lower) and swaps IX and IY, so that IY is the next frame and IX the one we came from. The entry at 7F5D does not decrement B.
7F5C DEC B One frame fewer to go
This entry point is used by the routine at 7CC0.
7F5D CALL $7F69 IX = the next frame (24 bytes lower)
This entry point is used by the routine at 7F56.
7F60 PUSH IX Swap IX and IY...
7F62 PUSH IY
7F64 POP IX
7F66 POP IY ...so IY is the new frame and IX the old one
7F68 RET
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