ERRATA PC driven Electrocardiogram (July 1995): There is an error in the BASIC listing published on page 61 of the July issue, which will prevent the program from displaying a trace on the screen. Line 140 should actually read: 140 FOR I=0 TO 640: Y=PEEK(&HFC4F+I)-110: IF Y>8 THEN LINE -(I,Y) Note that the error is only in the printed listing for the simple program, and the full version of the software (PC-ECG) can be downloaded from the EA BBS (353-0627), or ordered through our Readers Services Department. Note also, that the 100uF electrolytic labeled C14 should be labeled C15 on the circuit diagram Fig.1, and that the real C14 (0.1uF) connects between V+ and V-, not ground as shown. Both the PCB and the parts overlay diagram are correct.