Re: The Perfect Emulator?

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

"Bryan Parkoff" <nospam@nospam.com> writes:
>     If it is true what I claim above, Phase 1 will be used for Video Scanner
> and RAM Read or RAM Write.  If 17030 cycles are reached, the complete
> 280x192 pixels display in the screen.  I don't know how 7 pixels work in the
> horizontial scan per state.  It should be 7 pixel X 65 state equal 455
> pixel, but how can 560 (double resolution) be used?  Should it be 14 pixel X
> 65 state equal 910?

Only 40 out of the 65 cycles per scan line are used for video.  The other 25
are used for the border, blanking interval, and horizontal sync.  In the
hires mode you get 7 bits per cycle, so you get 280 pixels total (subject
to NTSC color artifacting).  In double-hires you get two bytes read from
memory per cycle, so 14 pixels are available for a total of 560.

> It looks like NTSC has only
> 119,210 pixels for TV, but 53,760 pixels are used for Apple II.

NTSC doesn't have *any* pixels.