made sure DMEM[0] is always 0 in the ti-74 port

mu808.b74

@@ -12,7 +12,7 @@
 210 IF IAT=1 THEN 220 ELSE 230
 220 X=INT(V1):Y=INT(V2):Z=INT(V3):IAT=0:GOTO 240
 230 X=A-CMD*10000:Y=INT(B/10000):Z=B-Y*10000
-240 V1,V2,V3=0
+240 V1,V2,V3,DMEM(0)=0
 250 IF CMD=5 THEN DMEM(Z)=X+(Y/10000):GOTO 180
 260 V1=DMEM(X):V2=DMEM(Y):V3=DMEM(Z)
 270 IF CMD=1 THEN 280 ELSE 420