On Wed, 9 Aug 1995 13:41:12 +0200, Frode Tenneboe said: > > Do you happen to know what the relationship is between the interrupts and > > the > > TV scan?
> You mean which one comes first and how much? Yes. By experiment I seem to have found that on the +3 the scan line reaches the start of the screen 14367 cycles after the interrupt is generated. > Yes. Then you meant "...should _have_ been written..."? :) I don't know whether it is or not. Do you mean that it isn't? > Are you sure about the 311 lines btw? I once drove pretty close to th limit > of a frame, and I'm pretty sure that was more than 311 * 228 cycles.... Yes, very sure. I wrote a timing program which displays a striped border without using the HALT instruction inside the loop. This allows me to mess around with the timing and find out exactly how long the delay was by looking at the position of the pattern. You can have a snapshot of it if you like. :-) The reason for all this is that I have implemented the stripey border effect in xz80 and at the moment it mimics the +3 precisely, but I don't have 48K speccy info. imc
