New PDF release: A Little Bit about Buffer Overflows

By John Cosimano

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This fills in for an occasional miss. The present system allows up to six or A TUNING INDICATOR If you don't have an oscilloscope for your initial testing or don't want to tie one up for eye diagram testing of incoming tapes, you can use this simple tuning indicator instead. When the light emitting diode is out, your data rate control is properly set. Adjust the data rate control to th e CENTER of the off portion of the display. The light emitting diode should stay off while good data is being received.

Between zero crossings, the capacitor is allowed to charge at a rate set by the BAUD AD JUST control. The CMOS inverter stages that follow (IC3c to IC4b, IC3d to IC4a) act as comparators. Circuit timing is adjusted so that the monostable produces an output at 3/4th the low frequency period, and nothing for the high frequency period. These output pulses are present only during digital zeros and are routed to an output flip flop that regenerates the one and zero data. A lockout on this flip flop, via the RESET input, prevents zeros from being output during leader time, and recorder start and stop intervals .

Put in a square wave and you record an impulse on the leading and trailing edges. Play this back and you get a double impulse, one pair at the AMPLITUDE SYSTEM NOISE LIMIT FREOUENCY Figure 7: The response cUlVe of an ideal audio recording head. leading edge and one at the trailing edge of the original square wave. There is no way to get a square wave back for a squ·are wave in. Now, the comp uter data recording people pull some tricks to simulate the recording of square waves. They use special heads and levels to saturate the tape in one direction or another.

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A Little Bit about Buffer Overflows by John Cosimano


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