Hi Leif, I don't think I have ever used my EZ232 with my C128DCR in UP9600 mode. I could test and see if I get similar results. Jim On Jan 11, 2016 10:41 AM, "Leif Bloomquist" <firstname.lastname@example.org> wrote: > Hi all, > > I got my "Wifi Modem" device working with the SX-64, thanks for the > help! (The trick was to lower my current limiting to 100 ohms). > > I've found a new issue, unique to the 128D and related to the UP9600 hack. > > The symptom is that with my device plugged in, the 128D's built-in > 1571 immediately goes to an error state (activity LED flashing > constantly) and I can't even read the error channel (PRINT DS$ returns > blank). > > This does *not* happen with a flat 128 and external 1571, so it's > something related to the 128D - I'm aware the 128D's 1571 has a newer > ROM revsion (3.1 vs. 3.0) and there is probably an electrical reason > here. > > Here's the schematic for my device: http://i.imgur.com/OVkLEMG.png > > I've found that if I disconnect Pin 5 ("Serial Port 1, from CIA #1") > it works. With the UP9600 baud hack, Pin 5 is looped back to Pin M > (TxD). > > This is the root of the issue but I'm not sure why. With other RS232 > adaptors (like Jim's EZ232) that support the UP9600 hack, looping back > Pin 5 to Pin M (via jumper) does not cause the issue. Also, as > mentioned this doesn't occur in a flat 128 and external 1571. So I'd > like to understand what the issue is before blindly adding a jumper. > > More details on my modem: > https://jammingsignal.wordpress.com/commodore-wi-fi-modem/ > > Thanks for any help! > > -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 list > Message was sent through the cbm-hackers mailing listReceived on 2016-01-11 18:00:48
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