Hi all, Some of you know I've been tinkering with an Arduino-based Wifi "Modem" for the Commodore 64 etc. (Pics here: http://imgur.com/a/ZvwO6) It's almost ready to go, however, one issue is that it doesn't work on the SX64, and it's the same issue on at least two SX's. The symptom is that while the Arduino receives serial data from the SX fine, nothing sent by the Arduino is received by the SX. I've also tried going directly to the Wifi board (which is also serial), same issue. It works fine on a normal 64/64C though. I'm aware that there are some differences with the SX User Port compared to a normal 64/64C (one of the 9VAC lines is "grounded", from what I've read). I don't have a lot of electronics background so I could really use some help. An EZ232 works just fine on my SX, so it's clearly possible. This is all at 2400 baud. Some theories I have: -I tied all the grounds (both signal and protective ground) on the user port together on my board, could there be an issue from the 9VAC coming through the ground? (I'm not using the 9VAC pins themselves, they aren't even connected.) -I'm going through 330 ohm resistors to protect the CIA (i.e. in case User port and Arduino pins are both outputs). Could this be putting the TTL signal out of spec on the SX, but not on the 64(C)? I'll post a schematic momentarily, but wanted to ask if anyone has some advice or info as to what the problem might be? Thanks -Leif -- Leif Bloomquist | email@example.com | +1 416-737-2328 | Check out my blog! http://www.jammingsignal.com "Every choice, no matter how small, begins a new story." - xkcd Message was sent through the cbm-hackers mailing listReceived on 2015-10-13 02:00:08
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