On Tue, Jan 12, 2016 at 11:40 AM, Geoffrey Oltmans <[email protected]> wrote: > That's useful, and I must confess I was looking at the wrong part of the > schematic! ;) > > I suspected that it must not be a straight through cable, because that would > be too easy. From his description it sounds like he ran across three > transistors, SOT-23 packages I'm guessing. According to a cross reference > most likely a PNP transistor with two built-in resistors, similar to what is > shown in the schematic on those same lines. > > I'll have to try and construct a cable, but the next hurdle is that I have > no disks! > >
I might be wrong but I don't think anyone has successfully created a TPDD cable other than one that used to be sold on EBay and that guy didn't publish his design. The theory is to sap power from flow control lines to convert from TTL levels supported by the TPDD to the minimum RS232 levels necessary for the Model T. -- John.
