You need to change the screen ROM $E000-E7FF. This is where the CRTC is set up. It is set up differently for 50 and 60 Hz. Everything else is the same. For 220 V instead of 110, you need to change the connections on the primary of the power transformer. 110 V uses the black and white leads. 220 V uses the red and either black or white. I can't tell which it is from the schematic. On Thu, 13 Dec 2012, "André Fachat" wrote: > > Hi there, > > I was recently asked an interesting question. > > Is it possible to take a 50Hz PET (with CRTC) and run it with 60Hz timing? > Same the other way round, can I take a 60Hz PET and run it with 50Hz timing? > > What are the limits of the screen hardware with respect to timing etc? > > Is there a difference in that between the 9" and the 12" screens? > > Thanks > André > > Message was sent through the cbm-hackers mailing list > wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2012-12-13 07:00:13
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