Virginia Williamson's Byte - September 1975 PDF

By Virginia Williamson

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Interconnect restrictions, needs a physical connection to the phone line, and needs its own hybrid or means of separating transmitted and received data. There are several basic ways to use modems. Simplex transmission goes one way only. Simplex with a back channel goes one way only, but provides for some low systems that are useful over ordinary telephone lines, based on the Bell 103, 202 and 400 series systems. You can rent these from the phone company or others, buy them outright from modem firms, or design your own with the guidelines of this chapter.

Values shown for 300 Baud rate. Recorder speed may vary ±30%. (a) Record circuit. IJ + 5 o---'III/'v------. UART TRANSMITTER CLOCK (MUST HAVE REASONABLE DUTY CYCLE) 0, +5 SUPPLY (b) Playback circuit. 022 10K 0----1 f-'lMr--'---'-~ (SYMMETRY) 150K RECEIVE '---------0 TO UART 0,+5 SUPPLY 30 DATA Fig. 8 shows us a set of standards for speed i n d e pen den t cas sette interface. All three standards are based on the code and bit timing of Fig. 2. A 110 Baud standard records 16 cycles of 1760 Hertz for a one and eight cycles of 880 Hertz for a zero.

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Byte - September 1975 by Virginia Williamson


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