of the waveform that will appear at the tester output and for compare channels an indication of when in time comparisons will occur as choices are made in the 34 pin format 34 field 52 the 34 clock phase 34 field 54 the 34 resolution 34 field 46 34 length 34 field 48 and the 34 delay 34 and 34 width 34 fields 56 58 the effects on the tester are made visible in this visual feedback area relative timing relationships are made visible at a glance color is used to distinguish between force and compare data graphic symbols are used to distinguish between window compares and edge compares with edges being shown with a minimum width and windows with a width that is proportional to their actual width similarly single channels and groups of channels are shown with single lines and double lines respectively while tri stated channels are shown with blanks during inactive periods and little triangles during periods when comparisons are being made as was mentioned above fig2 shows a timing diagram of the formats available in the tester of the preferred embodiment fig6 shows a list of compare formats 64 opened for selection to obtain this list the use pressed the 34 open 34 hardkey on the keyboard not shown while the field cursor 68 was located in a row 55 which has compare selected 70 in the 34 pin function 34 column 50 referring to fig9 when.