On 10/13/2015 03:09 AM, Leif Bloomquist wrote: > 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. What kind of CIAs do the different Systems use? At the end of 1986, Commodore changed the process from NMOS to HMOS-II. For a short while, some CIAs were labeled '8521R0' but then they went back to the '6526' label. Usually they were also fast enough for get the 'A' for 2 MHz operation. The HMOS-II-CIA also changed a bit timingwise, that's where the legend originated that the 6526A behaves differently than the 6526. So the question is, does the HMOS-II-CIA work where the NMOS-CIA doesn't? Gerrit Message was sent through the cbm-hackers mailing listReceived on 2015-10-13 06:00:08
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