Checkout the files section.? Note: none of this is verified and YMMV,? I don't have this radio! Just interest in such things and late night technical ramblings.?
A check of the Service manual SM-2000 and it appears when the CPU puts the radio in programming mode (as per the programming manual) it switches over three lines IC412 4053.
DO, DI and SK from their normal functions on the 6pin RJ MIC connector , PTT, Mic and Hanger.? CS is also needed for 93C46 EEProm is present on the Mic connector.?
Tried the software SMP4004C in Dosbox-x and boy I miss the simple DOS programs, that actually work in a small amount of code.?
Just don't know how they generate the SK = serial clock pulses. The SMP2000 cable looks like a 9pin D to the 6 pin mic plug. Maybe worth a CRO look at the pins when trying to program to determine if there is a clock pulse there somewhere! CCT also shows an 8 pin socket inside the radio with same programing pins.?
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Otherwise?
Then as a last resort I found page to directly read the EEProm and be able to write data from the software back into it. Again all care and no responsibility!??
might be useful information too.?
/Can only say good luck mate.?
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Maxwelloau VK5AC.
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maxwelloau