PRM80 - UHF programming problem

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PRM8020 unable to WRITE config

Using the programming software 4.0, HW-program to change model, and SW-program to change parameters and frequency.
Have two PRM80 VHF radios that I have changed model numbers, so they receive/transmit on 2 meter ham band - Everything works great, no problem..
I also have two UHF PRM8020, I can read the configuration, but I am unable to write to the radio.
Tried to change model, this does not work.
Tried reading parameters/frequencies, this works fine.
Writing the same parameters/frequencies back to the radio does not work.

My programming cable, and the program works (I can program the VHF radios) - But why does the UHF radios fail???
Any one had the same problem? Found a solution?

best 73
oz9els - Niels
 
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Just been plowing through some documentation:
When programming the EEPROM, as occurs in initial configuration of the equipment, the following steps occur. First the EEPROM is sent a write enable command. This consists of the enable line to the device going high and then the write enable command is clocked into the device using the serial clock and data lines. 9 bits of data are clocked in. The enable line is then returned low.
Could it be some kind of a problem with the "enable line" not going high?
 
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SOLUTION
Was  originally programming the radio on an old Wyse V10L thin client (CPU: VIA C7 Eden 800MHz) rebuild for DOS. This worked for the VHF version, and I was able to READ the UHF radios, but NOT WRITE back to them.
After some fiddling around, I decided to try another old thin client that I had rebuild, this time a Neoware CA5 (CPU: SiS550 200MHz). With this (slower) computer I actually succeeded in changing the model number and was able to programm HAM frequencies into the radio.

My conclusion is that the programming of the UHF versions of the radio needs a (very) slow PC.

PS as slow PCs are hard to get nowadays, Thin Clients is often VERY cheep, and a lot easier to get your hands on. Again I would point you to a great resource for this kind of PC: https://www.parkytowers.me.uk/thin/ (I am not afiliated to this site, but it has VAST amount of resources and information, and I simply think it's GREAT ;))

Best 73s oz9els
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