The patch you are referring to is very, very old and very wrong. Have a look at this assembler:
PCPAS:UNIT=ELP6,CI=S73577A;
Y;
PCASE:UNIT=ELP6,CI=S73577A;
Y;
/* ENTER ENTEXLSTA */
PCASI:UNIT=ELP6,REV=2-R3A,CI=S84905A,IA=2848,RA=2856,BYTE=0;
MOVE.W #$0,(0,A3); ...