Maxon PM100 PMR EEPROM - Page 1
Forum section: electronics / repair

author: david17
author_rank: Newbie
timestamp: March 18, 2024, 08:18:32 pm
content: 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.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 19, 2024, 04:13:25 pm
content: well post the eeprom content first, and maybe some can or could help

author: david17
author_rank: Newbie
timestamp: March 19, 2024, 06:07:29 pm
content: 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\00000080:\00\00\00\00\00\00\0F\00\0F\00\00\32\00\00\00\00\000090:all FF to endMy bin file after removing a lot of 00 and FF at the end.David

author: coromonadalix
author_rank: Super Contributor
timestamp: March 19, 2024, 10:47:06 pm
content: found this today scroll down to maxon ....http://www.cqham.ru/sch_eng.htmlinterfaces and softwaresas i see it86\08\97\26\D6\17 is one channel86\08\97\26\D6\1786\08\97\26\D6\1786\08\97\26\D6\17for the rest

author: david17
author_rank: Newbie
timestamp: March 20, 2024, 05:15:50 pm
content: 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

author: coromonadalix
author_rank: Super Contributor
timestamp: March 20, 2024, 05:36:21 pm
content: you have hex to decimal converters on the webit could be in reverse meaning lsb in 1st and msb in last positionfor the files i downloaded them with no problem ... must run on a 32bit machine or older ... files have 1997 dates ....

author: david17
author_rank: Newbie
timestamp: March 20, 2024, 06:15:21 pm
content: OK, I will download the files on an old XP laptop I have.I have decoded to dec.hex 86\08\97\26\D6\17dec 134/8/151/38/214/23

author: david17
author_rank: Newbie
timestamp: March 26, 2024, 09:06:38 pm
content: 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?

author: bingo600
author_rank: Super Contributor
timestamp: March 28, 2024, 08:25:26 pm
content: Just an idea ...Thishttp://radiomanual.info/schemi/Surplus_Civil/Maxon_PM-100_SM-2000_serv_G3VFP_1998.pdfPoints to this PLL Chiphttps://www.nxp.com/docs/en/data-sheet/MC145191.pdfThat chip seems to have 3 registers taking :REGC : 8bitREGA : 24bitREGR : 16bitThat gives 48bits ==> 6 bytesThat Rings a bell here ... Same length as your channel data/Bingohttp://www.hallelectronics.com/getech/maxprog.htmhttps://hamfiles.co.uk/forum/index.php?page=topicview&id=radio-help-advice%2Fmaxon-pm100-pm160http://www.radioinfoboard.com/viewtopic.php?t=1948Prog sw might be here too - needs membershiphttps://groups.io/g/radioprogramming/files/Maxon

author: david17
author_rank: Newbie
timestamp: April 01, 2024, 10:12:45 am
content: 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.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 01, 2024, 03:37:38 pm
content: attached stuff belowpaying 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=1948and this other site, but 1 download every 4 days when registredhttps://www.mods.dk/manual.php?brand=maxonbut SW side there seem to be confusion about Maxon brand, apparently there is some programmer brand named Maxonfinally be very very careful some site report programming software ... i just got out of a NASTY surprise ....