Differences

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+ ====== CP2102 USB-TTL Interfacing ======
+With so many people trying to program the PRM80 and such with a new computer with no legacy serial ports, time to look into it.
+The PRM80 FPP will refuse to read or write to the radio unless the Legacy Control pins, DSR and CTS are pulled high on the interface. Hence why Pins 4 and 6 are bridged and pins 7 and 8 are bridged on the Programming interface diagram that is floating around the internet.
+This Mod has been proven to work in conjunction with [[dosbox|DOSBox]]. Im not going to state that it will work directly with XP, as there are so many other variables. But on that note, I have been successful on a Genuine IBM only.
+This Documentation has been written about the Deal Extreme CP2102 converter P/N 152317. Other CP2102 units should work but you have to work it out for yourself.
+Have a look at the following picture and diagram, you have to bridge the pairs of pins to make this work.
+{{ :cp2102ph.jpg?direct |}}
+{{ :cp2102pinout.png?direct |}}
+Afterwards, install the Virtual Serial port driver in Winblows.
+Then set the correct port in DOSBox as shown in the [[dosbox|Dosbox]] page
+Wire it up with the following diagram to your radio and it should work.
+{{ :prm80-interface-cp2102.gif?direct |}}
+Note that the T and R pins are reversed on my drawing for clarity.

VK3SMB