On 2/11/2012 11:20 AM, Gerrit Heitsch wrote: > On 02/11/2012 06:02 PM, Jim Brain wrote: >> > If you want to use the motor line for I2C, but still be able to use > the tape drive, why not set up a low pass filter on it so the motor > line that the tape drive sees only gets activated if there is a true > static signal on the line and not the I2C data or clock. > > Gerrit > > > Message was sent through the cbm-hackers mailing list I'd prefer not to use the MOTOR line, due to the voltages, the possible skew, and the upper limit on switching speed due to the voltage division used (resistors). As well, it's rather substantial in amperage, so the parts needed to low pass filter that signal are not trivial. I will admit that using MOTOR for the SCK line and WRITE for READ/WRITE has some merit, but I worry that if someone leaves the tape in RECORD mode, I will send data to the datasette when cycling MOTOR and applying signals to the WRITE line. Using WRITE/SENSE wtihout motor minimizes that concern. Jim -- Jim Brain brain@jbrain.com www.jbrain.com Message was sent through the cbm-hackers mailing listReceived on 2012-02-11 18:00:23
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