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Download Three digit channel entry system
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US. Patent May 28, 1991 Sheet 3 of 3 5,020,140 300 310 RECEIVE DIGIT 385 NO 1ST DIGIT \? YEs 2ND NO DIGIT DIsRLAY o _ 0N scREEN 390 330 YJ CLEAR LEADING zERo FLAG 1 SET LEADINr zERo Hi6 LEADING zERD FLAG SET ENABLE E40 360 2-DIGIT DISPLAY ENTRY MDDE 10N scREEN J ENAi E - L ENTRY MODE ‘ I EXIT TO REMAINDER OF PROGRAM 370
