Re: Help with SX64 User Port?

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 | leif@schemafactor.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 <hwarin@neuf.fr> 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 : owner-cbm-hackers@musoftware.de
> [mailto:owner-cbm-hackers@musoftware.de] De la part de Justin
> Envoyé : mercredi 14 octobre 2015 01:19
> À : cbm-hackers@musoftware.de
> 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 <traymond20@gmail.com> wrote:
>
> Hi Leif,
>
>
>
> This is a good option for internet access I would use this device.
>
> -Terry Raymond
>
>
> On Tuesday, October 13, 2015, <silverdr@wfmh.org.pl> wrote:
>
>
>> On 2015-10-13, at 03:28, Daniel V. Mackey <n2dvm@arrl.net> 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!
>
>
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>
>
>
> --
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