Hello everyone, I'm a new member, out of Belgium, I have a dozen of vintages PCs, I especially likes laptops. I'm an electronics engineer which helpes for fixing. Thanks for welcoming me and thanks to whoever created this in the first place.
I'm trying to make the internal modem of my Tandy/RS Model 102 work again. I've connected it to a small home phone exchange (pabx) so that I have real proper vintage phone lines , but the same problem occurs on my home phone line (which is not PSTN anyway, it's an emulated analog line turn into voip by a modern cable modem router) I absolutely wanted to have my own "lab" of proper PSTN lines so that's why I have my little PABX from the 90s; which gives me the possiblity to experiment with modems. My problem is ; my model 102 does not pickup the line. A regular analog phone does, a good old USRobotics Courrier 56K does, but the T102 does not. I have the proper Tandy grey/beige(rather pink now) cable It's inserted in the right way. My init string (STAT) is starting with M, for internal modem If I put a phone on the gray line, and "pink" in the PABX ; i can hear my PABX's dial tone, until I make the M102 dial, in which case the phone goes silent (which is normal). But the PABX doesnt show the line as beeing picked up (a led should turn red), I can hear the M102 pulse dialing "in the void", but to no end... The PABX supports pulse dial. I tried 10pps and 20pps. But it seems the problem is not dialing, it's the actual, i'd say "electrical" pickup of the line. It seems either the voltages are not right, or something is not working like it should. I tried BASIC with "CALL 21200" (which pickups the lines) you can hear the relay click, but again, the PABX does not see that as someone picking up a phone. I have an European M102 (could that be an issue ?) My "phone line" (vintage PABX) is a european (belgian) one. However the M102 has been "upgraded" by a REX# v2.0 rom by the previous owner, that may be an issue (this upgrade was not my doing. I can barely use REX.) I'm with TSDOS101 It's unclear if, eventually, the modem section could need a repair (recap or smth) Another possilbity would be that the tone i'm giving it (440Hz over here) is not recognized (seems to be 600Hz in the US), but I find this unlikely this would be software controlled, and my M102 is a Belgian model it even has the "RTT" (telco of the time) sticker on it I'm out of ideas. Any help greatly appreciated
