Labels:text | font | black and white | white | printing OCR: THE PROGRAMABLE BLUE BOX BY PETER PIPER The Phone Phreak like everyone else must keep pace with TAP technolegy. We therefore give you The Programable Blue Box. The Box presented here offers excellent stability with both voltage and temperature. It uses 9 IC's, all of which are readily available. And uses two ordinary 9 volt alka- line batteries. Current drain is relatively low - 24 ma. in standby, about 30 ma. sending tones. Circuit Description Wien a key in ; ressed, the diode matrix in fip. 1 produces a binary code on lines A through D corresponding to the key pressed. Note the code 0000 is not used here, it is reserved for 2600. whenever a key is pressed the S line MAR-APRIL 1979 No. 56 also goes high, indicating a valid code on lines A thru D. In fig. 2, lines A thru D and S go into th ...
