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FF64: Prepare BASIC Return
Writes the address ReturnToBasic into the error stack pointed to by ERR_SP. Called by BASIC line 4040 as FF64 before returning to the editor after a SAVE.
PrepareBasicReturn FF64 DI Disable interrupts.
FF65 LD HL,($5C3D) HL=*ERR_SP; write ReturnToBasic there.
FF68 LD DE,$FF6F
FF6B LD (HL),E
FF6C INC HL
FF6D LD (HL),D
FF6E RET Return.
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