Cedric, who did you buy it from? I can go through my emails to find out the history. Thx Steve
On Thursday, February 3, 2022, Cedric Amand <[email protected]> wrote: > Thanks, i'll try all that. > I must admit I don't fully understand what the REX# does, as I've only use > it to make backups of the RAM, but it's features go way beyond that, so > it's unclear to me if - for example - the tsdos that comes with would be > "US minded". > > From what I understand, the original owner (which may even be in this > list) had to replace the belgian/european ROM with another ROM, most likely > a US one, to be able to use the REX# ( that's what I got from what he told > me, don't quote me on this ) > > All these changes could, maybe, break my modem. > > However i've been looking at the schematics of the modem part and all of > this is as simple as can be, it's really purely analog in many areas, and > there is no way on earth any of this is software controller. I mean : the > thing doesn't care if the dial tone is 440, 600 Hz or anything (at least > looking at the hardware I see no way this would be measured, even less > handled by software) > > So if I take for granted my M102 is a Belgian.european one (it' has the > sticker of the telco!), I guess the electronics where adapted to our > particular voltages. > What could be a possibility if that some of these are now out of spec > > One final comment ; if I hit F4 (TERM) in TELCOM, the M102 starts to emit > an awful noise (like if it was connected to a data line !) it does that > even when the M102 is not connected to anything ( I mean, no wire connected > to it at all) It is also, afaics, completely crashed (i have to > reset/reboot) > Is that "normal" ? > That would point to a problem with ROM/REX... > > > thanks again for taking the time to help weirdo that wants his analog > modem to work :) > > > > Le jeu. 3 févr. 2022 à 23:32, Brian K. White <[email protected]> a > écrit : > >> I can tell you one thing for sure, the REX has no effect on the modem. >> >> But you can prove that to yourself by just removing it. It doesn't hurt >> anything and it won't even lose it's programming. Just pop it out, and >> see that it made no difference. >> >> Have you tested the line with a plain analog telephone? >> >> Have you verified the modem cable doesn't have a broken wire? >> >> Since you are talking about dialing vs answering, is the the ANS-ORIG >> switch in the ORIG position? (Answer vs Originate) >> >> Measure the voltage between tip & ring when the the modem is on-hook. It >> should be 48vdc >> >> Measure the current on either tip or ring when the modem is off-hook. It >> should be about 20ma, at around 9vdc (actually a wide range from 3 to 12) >> > >
