Routines
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AE20: get vector, execute function then continue evaluation
Used by the routine at AD9E.
AE20 B9 82 A0 LDA $A082,Y get function vector high byte onto stack
AE23 48 PHA
AE24 B9 81 A0 LDA $A081,Y get function vector low byte onto stack
AE27 48 PHA
now push sign, round FAC1 and put on stack
AE28 20 33 AE JSR $AE33 function will return here, then the next RTS will call the function
AE2B A5 4D LDA $4D get comparrison evaluation flag
AE2D 4C A9 AD JMP $ADA9 continue evaluating expression
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