230 TMP=PEEK(53248):IF TMP<4 OR TMP=8 THEN 310310 IF TMP=0 THEN 250320 R=48*INT((PEEK(1696)-30)/16):C=2*INT((PEEK(1692)-SCROLL-COARSE*8-47)/16):R=R*(R>=0)330 INV$(R+C+3,R+C+4)="":INV$(R+C+291,R+C+292)="":EF=2390 RETURN 1020 IF EF=0 THEN 10801030 INV$(R+C+3,R+C+4)="":INV$(R+C+291,R+C+292)=""1120 IF STRIG(0)=1 OR PEEK(1700)<>0 OR PEEK(1720)<>0 THEN 12501250 EF=EF-(EF<>0)5270 SCROLL=0:CHANGE=1:SB=0:EF=0:COARSE=0