[Coco] Video band width and accessing video memory

[tim franklinlabs.com]

   320x225x4 can either be 4 pixels or 4 color. The math is the same. 2
   bits / pixel.:
   color 0: 00
   color 1: 01

   color 2: 10

   color 3: 11

   William, his original post was about a CoCo1/2 not a CoCo3. The GIMI
   handles the RAM timing completely different than the SAM/VDG. But I
   know you know that LOL :)

   On June 2, 2019 at 3:06 PM Alex Evans < [1]varmfskii at gmail.com> wrote:

   just a misunderstanding. One person sees 320x225x4 and thinks four

   colors and another thinks four bits.

   On Sun, Jun 2, 2019 at 12:01 PM William Astle < [2]lost at l-w.ca> wrote:

   >

   On 2019-06-02 11:32 a.m., tim franklinlabs.com wrote:

   One thing I'd like to point out is that your math is slightly off. 320

   * 200 * 4 is correct but there's four pixels per bite so the final

   calculations is 18000 bytes not 36000.

   Actually, 16 colour modes only have 2 pixels per byte. There is, in

   fact, a 320x225 16 colour mode. Thus, his resulting number is correct

   even if his listed math is wrong.

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References

   1. mailto:varmfskii at gmail.com
   2. mailto:lost at l-w.ca
   3. mailto:Coco at maltedmedia.com
   4. https://pairlist5.pair.net/mailman/listinfo/coco
   5. mailto:Coco at maltedmedia.com
   6. https://pairlist5.pair.net/mailman/listinfo/coco