This was crazy since Processor Technology (this is hosted on sol20.org) already had a good system, as did others. A good lesson in standardization failure. I

This was crazy since Processor Technology (this is hosted on sol20.org) already had a good system, as did others. A good lesson in standardization failure. I remember Tarbell being the popular one, though the Wikipedia doesn’t say so particularly. IIRC it was just a recording of the Bell 103 modem signal.