The official specs that I found for the cassette port say that it runs at 1500 bps, but the bits are sent as a single 1200 Hz cycle or a single 2400 Hz cycle so the length of a single bit varies depending on whether it is a one or a zero.
If you assumed an average density of ones and zeroes then the bit rate would be the average or 1800bps, and if you said the user only "gets" eight bits for every nine saved to tape then you would have 8/9th of 1800bps which would be 1600, hmmm... that doesnt work out to 1500 either. So, how do you get 1500bps as the cassette data rate specification? Douglas
