Hi brains trust, I recently ordered this 'The Old Net' RS232 Wifi Modem from Tindie: https://www.tindie.com/products/theoldnet/rs232-serial-wifi-modem-for-vintage-computers-v4
Overall I'm really happy with it, and it seems to work perfectly with my vintage Macs. However I'm having the strangest issue with my Apple //e and the Super Serial Card.
Literally, no matter what settings I try, no matter what cabling I use, no matter what software, it's like the 'echo' Hayes setting is stuck on. Everything I type is echoed back to the screen. Eg when connected to a BBS I type 'A', I get 'AA'. When configuring the modem if I set ATE0 I should see no typed text whatsoever, but I still see what I type as if this is set ON.
This only happens with the Wifi Modem. If I hook up to my PC or Raspberry Pi using TCPSer, this does not happen. I find this really strange, as I can't pin down where the problem is, as both the Apple //e and Wifi Modem work perfectly with other devices, just not with each other. These are the fixes I've tried so far:
- Different DIP settings (anything that will actually produce a working terminal prompt) including SW 1-7 off or on toggle (which is mentioned for similar products).
- Different Super Serial Card (I own two, both tested working)
- Different cabling (I have tried both straight through and null modem cabling, with the terminal block rotated on the card accordingly)
- Different software (I have tried ProTERM and ZLink, no difference. I have also tried numerous BBSes and my input is always echoed)
- Different modem settings (I have tried reversing pin polarity, toggling handle Telnet, quiet and verbose mode, different baud rates, and of course the echo setting).
- If I do enable echo on the modem (or locally on software), my text is echoed twice in the modem config screen and three times when connected (eg typing 'A' produces 'AAA)'.
- Modem factory reset (no change)
- Modem firmware update (no change)
At this point I'm frustrated, I have no idea what to try next, I don't have another Apple //e to test on.
Something suspicious I've noticed is that the 'R2IN' pin on the MAX3232 is not connected to the board, I don't know enough about how this should work to know if this is important (it seems like this is normally connected to TX on the DB9 port, but in this case R1IN is connected there instead). Just seems odd?
Any help would be appreciated!