Re: Mental challenge: the rainbow

["Michael J. Mahon" <mjmahon@aol.com>]

BLuRry wrote:
> Is it possible to sync with VBL such that during VBL, and during the majority of each HBL the apple is put in a text mode but during active signal output throw it back to graphics?  That should fake out the apple to not send a color bust, right?   Would be interesting to get a grayscale mode... really just for kicks if nothing else.

As Vlad recently noted, NTSC monitors do not switch instantly from color
to monochrome and back.

To allow for color reception under marginal signal conditions, the mode
switching typically occurs over several frame times, and is a precise
standard, so this switching 1) cannot be done quickly, and 2) cannot
be done with reliable results for various monitors.

Typically, switching from monochrome to color occurs more quickly than
switching back from color to monochrome, but both time constants are
long relative to intra-frame times.

-michael

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