[Coco] Video band width and accessing video memory

[L. Curtis Boyle]

A lot of sparklies is caused by software timing issues (mainly, changing palettes mid-scanline). Most can be resolved by either changing them only during HBLANK or VBLANK. 

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> On Jun 3, 2019, at 4:14 AM, Gene Heskett <gheskett at shentel.net> wrote:
> 
>> On Monday 03 June 2019 12:52:50 am L. Curtis Boyle wrote:
>> 
>> I think I remember mention that some of the hardware scrolling
>> required RAM running at least 142 ns to run fully reliably, and that
>> the 150 ns parts did cause issues at times.
>> 
>> 
>> L. Curtis Boyle
>> curtisboyle at sasktel.net
>> 
> That makes me wonder if faster ram would have fixed the sparklies in the 
> earlier gime chip.  Just saying since faster ram is peanuts these days.
> 
> [...]
> 
> Cheers, Gene Heskett
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