Maxon PM100 PMR EEPROM

[david17]

Hi, I have removed the EEPROM AT93C56 from the pcb and read the code with a TL866. At the moment, all 4 channels are the same 171.43762. I would like to re-program this to 2 meters. Any idea how to work out the code needed.
Thanks, David.

[coromonadalix]

well post the eeprom content  first,  and maybe some  can or could help

[david17]

000000:86\08\97\26\D6\17\86\08\97\26\D6\17\86\08\97\26\
000010:D6\17\86\08\97\26\D6\17\

000060:\C8\C8\C8\C8\00\00\00\00\00\00\00\00\00\00\00\00\
000070:00\00\20\0A\00\00\03\30\00\00\00\00\00\00\00\00
000080:\00\00\00\00\00\00\0F\00\0F\00\00\32\00\00\00\00\
000090:all FF to end

My bin file after removing a lot of 00 and FF at the end.
David

[coromonadalix]

found this today   scroll down to maxon  ....

http://www.cqham.ru/sch_eng.html   interfaces and softwares

as i see it

86\08\97\26\D6\17  is one channel
86\08\97\26\D6\17
86\08\97\26\D6\17
86\08\97\26\D6\17

for the rest

[david17]

Yes, as my 4 channels are the same  86\08\97\26\D6\17  must = 171.43762. Would be nice to know how the hex is worked out for other frequencies.
I had found the site in the link you sent. When click on the software link I get "File not downloaded: Potential security risk." so I stopped there.

I would think the code at the bottom is the power setting and CTCSS frequency.

The interface circuit shows a 25 pin coms connector not in my radio.

Thanks, David

[coromonadalix]

you have hex to decimal converters on the web

it could be in reverse   meaning  lsb in 1st  and msb in last position 

for the files i downloaded them with no problem  ...  must run on a 32bit machine or older ... files have 1997  dates   ....

[david17]

OK, I will download the files on an old XP laptop I have.
I have decoded to dec.

hex 86\08\97\26\D6\17
dec 134/8/151/38/214/23

[david17]

If I saved the code from my pm100 on to a DIL version of the AT93C56 that's a KM93C56 the code read back is not the same. This is with a minipro tl866. This AT 93C56 is listed in the tl866. I can save the code to M27c512 and read that back OK.
Anyone been able to reprogram this chip? 

[bingo600]

Just an idea ...

This
http://radiomanual.info/schemi/Surplus_Civil/Maxon_PM-100_SM-2000_serv_G3VFP_1998.pdf

Points to this PLL Chip
https://www.nxp.com/docs/en/data-sheet/MC145191.pdf

That chip seems to have 3 registers taking :

REGC : 8bit
REGA : 24bit
REGR : 16bit

That gives 48bits ==> 6 bytes

That Rings a bell here ... Same length as your channel data

/Bingo

http://www.hallelectronics.com/getech/maxprog.htm

https://hamfiles.co.uk/forum/index.php?page=topicview&id=radio-help-advice%2Fmaxon-pm100-pm160

http://www.radioinfoboard.com/viewtopic.php?t=1948


Prog sw might be here too - needs membership
https://groups.io/g/radioprogramming/files/Maxon

[david17]

bingo600. I have all the downloads you listed. I did notice my code matches with the 3 registers. I tried to work out the order they were sent but got a bit lost. My set TX power is set to HIGH so the 7th bit of C reg has to be a 1 but can't match that up. The code from Hamfiles is a DOS/Windows zip. I have loaded XP on an old laptop and will try that on there. I can read from the EEPROM with my TL866 save to an old eprom and that reads back ok, but if I save to an 8 pin DIL 93c56 and read back the code is not the same. I have ordered a SM AT93C56 to see if I can save to that. I tried with an Arduiono but as this is very old chip most of the libraries have gone.
If R reg is sent 1st then REFERENCE MODE, REFout = REFin/2 and R counter = dev by 1544.
Thanks for your help.   

[coromonadalix]

attached stuff  below

paying site ?
this one as them  but there apparently an V1  and V2  models ??
https://radiosoftware.online/~OTHER_STUFF/MAXON/SOFTWARE/

for the cable interface ?

found this ?
http://www.radioinfoboard.com/viewtopic.php?t=1948


and this other site, but 1 download every 4 days  when registred
https://www.mods.dk/manual.php?brand=maxon


but SW side  there seem to be confusion about Maxon brand,  apparently there is some programmer brand  named Maxon

finally  be very very careful   some site report programming software ...  i just got out of a NASTY surprise ....