The following set of instructions for the setup of the MAC 1200 ECG machines allows necessary information to be entered for the HeartBEAT Participant ID, HeartBEAT alpha-code, and the HeartBEAT Technician ID number. The word "HeartBEAT Study" and the site ID number will be set in the default memory. The following setup recommendations will print one paper copy, automatically save the ECG in memory after printing the paper copy, and will not delete the saved electrocardiograms until they are either manually deleted or the machine runs out of memory. Site-specific technician ID numbers can be set in the default memory and will appear as a pull down menu for the technician to choose his/her ID number.