> Von: Rob Clarke <firstname.lastname@example.org> > It's still not clear to me why different register settings were required > for 60/50mhz versions when the PET board and monitor operates on DC. Is > it just to avoid minor artifacts due to ripple on the supply? Also, are I think it's probably the same reason as for the TV sets - interference effects with other light sources in the room. (or maybe even ripple effects on the supply too.) > the register sets independant of the monitor size? I would assume that > all 80 column machines had 12" displays, but are the registers actually > setting the machine up for 80 columns or setting it up for a 12" display? I haven't really made a table, because the different ROMs have many different timing values. If you look at the bottom of this page http://www.6502.org/users/andre/petindex/crtc.html they even differed in number of screen scanlines(!) between the 40 and 80 col machines - even though (as far as I understand) the fat-40 and 80 column models had the same screen hardware (at least that's what I would do). It seems to work as long as the refresh frequency was basically correct (compensating with the scanline duration) AndrÃ© -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de Message was sent through the cbm-hackers mailing listReceived on 2012-04-26 06:00:37
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