chem194@csc.canterbury.ac.nz (John Davis) (01/26/91)
Has anyone out there got any practical examples of programming the
ECS agnus variable sync/blank registers to roll their own video modes??
I've got some sketchy documentation on the ECS chip registers (obtained
from CBM NZ), but all it's got to say about setting up non-standard modes
is 'other modes, such as VGA (31khz programmable mode) disable the hard
stops on display sync and blank. DO NOT WRITE TO THIS REHISTER' which
isn't really a lot of help!
What I really need are examples of the hsstrt,hsstop,vsstrt,vsstop etc register
values should be for PAL and NTSC, and information on how the values relate to
each other, at the moment I'm trying to suss the interelation by trial and
error, but I'm getting nowhere fast...
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