Thanks everyone. I found the problem. The SX doesn't like the 330 ohm current-limiting resistors on the RX line. I jumpered it directly and it works. I'm uncomfortable with not having current-limiting, *especially* on an SX64 which is such a pain in the butt to repair, so I'm going to experiment with finding a value that works. Not sure if the issue is the cable length (as described below), or the CIA as Gerrit suggested, but at least it's (theoretically) an easy fix. I looked into buffers but was unable to find a through-hole *bidirectional* buffer, so I'll stick with this approach unless someone has a different solution? 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 On Thu, Oct 15, 2015 at 6:18 PM, hwarin <firstname.lastname@example.org> wrote: > Exactly the same as you are … In my “office”, I still have a plastic C128D > on my desktop and a SX64 right behind me, over a 8250… but no stock C64. In > case of any need, I can make tests/measurements on my regular SX and some > checks/compare on another one, for spare parts but known to be fully OK. > > > > FYI, I have under the hand a “commodoreserver.com” user port to NIC board > (rev 2.c). It never appears to be working but the serial to NIC interface > (WizNet) was confirmed ok. From what I’ve found on this issue, my > commodoreserver board has an issue with 3.3v/5v handling that have been > corrected in later revisions. > > > > Another possibility for this issue could be cabling … distance from 6526 to > user port is far longer with the SX … may be some buffers could help ? a VIC > 1011 works well with the SX; you might try with some userportà true RS232 à > Arduino interfaces > > > > About (Pics here:http://imgur.com/a/ZvwO6) : Nice toy … > > > > > > ________________________________ > > De : email@example.com > [mailto:firstname.lastname@example.org] De la part de Justin > Envoyé : mercredi 14 octobre 2015 01:19 > À : email@example.com > Objet : Re: Help with SX64 User Port? > > > > I really like my SX-64 because the keyboard is so much better to type on. > Same thing with the 128D. I doubt I'm alone. > > Justin > > > On Oct 13, 2015, at 17:52, Terry Raymond <firstname.lastname@example.org> wrote: > > Hi Leif, > > > > This is a good option for internet access I would use this device. > > -Terry Raymond > > > On Tuesday, October 13, 2015, <email@example.com> wrote: > > >> On 2015-10-13, at 03:28, Daniel V. Mackey <firstname.lastname@example.org> wrote: >> >> At 09:25 PM 10/12/2015, you wrote: >>> Thanks, I know about the mod (link is >>> http://project64.c64.org/hw/sxuserport.txt, I believe). >>> >>> I'd hate to have to ask users to mod their SX, especially since an >>> EZ232 works on a stock SX64. >>> >>> Cheers, >>> -Leif >> >> >> Yeah but how many people will use an SX? > > I have quite surprisingly high number of requests regarding DolphinDOS for > the SX. It is becoming somewhat more popular among the hobbyists recently, I > guess. > > -- > SD! > > > Message was sent through the cbm-hackers mailing list > > > > -- > Sent from Gmail Mobile Message was sent through the cbm-hackers mailing listReceived on 2015-10-25 18:00:08
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