I love that someone has thoroughly investigated this, what a fun read! On Tue, May 25, 2021 at 10:58 PM Jerry Davis <[email protected]> wrote:
> This discussion with attached source code and patent documents might help > answer your question in detail: > > > https://www.vcfed.org/forum/forum/genres/tandy-radio-shack/57410-story-behind-1500-baud-decisions > > Jerry > > On Tue, May 25, 2021, 9:42 PM Douglas Quagliana <[email protected]> > wrote: > >> 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 >> >> >> >> >>
