Hi Olaf, > I presume it is possible. The reason that I think that is that the > SuperPET ROMs provide for a 60Hz setting, and I never heard about > separate American/European versions of that. So the 60 Hz must have been > used on European machines as well. I think that you're right about this, but it's possible that 50 Hz ROMs for 6809 mode do exist and nobody has dumped them yet. There seems to be many more North American SuperPETs around than European ones. I have read that the 6809 mode has a software real time clock but I haven't tried to use it. It can be accessed with the TIME$ variable in Waterloo microBasic. The back of the Waterloo 6809 Assembler manual also lists date and time routines in the ROM. It must not keep accurate time if the IRQ fires at 50 Hz but the ROMs expect it at 60 Hz. The High Speed Graphik (HSG) board is another interesting case. It generates its own video signal with a Thomson EF936x and was only sold in Europe for 50 Hz machines. Some people have installed it in 60 Hz machines and reported that it works. Regards, Mike -- Mike Naberezny (firstname.lastname@example.org) http://6502.org Message was sent through the cbm-hackers mailing listReceived on 2012-12-16 23:00:05
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