On 2012-04-13, at 14:48, Rob Clarke wrote: > > > The TOD clock on the CIA's has a control bit which indicates whether the > clock signal is 50 or 60 hz. I could not for the life of me remember how > this gets set by the Kernal. In the 64 there is a flag at $02A6, which is set on the POST. I don't recall if this value is used elsewhere in the KERNAL but wouldn't be surprised if it isn't. > The CBM-II's had a jumper on one of the TPI's > but AFAIK, the only jumper on the 64 boards was only for the clock > divider, and not hooked up to any of the control ports. As the 64 kernal > was region agnostic, how did it set the 50/60hz control? By checking for raster IRQ at NTSC non existent line. 311 AFAIR. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2012-04-13 13:00:52
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