[Coco] replacing main rom

[Arthur Flexser]

I think phosphor persistence would tend to dilute the flickering effect and make
it less noticeable, rather than having the effect of slowing down the blink.

Art

On Fri, 13 May 2005 jdaggett at gate.net wrote:

> What probably slows the fast blink is the persistance of the 
> phosphor of the CRT. IIRC the persistance is far greater than 2 mS. 
> more in the line of 20 mS. 
> 
> james
> 
> 
> On 13 May 2005 at 0:19, Arthur Flexser wrote:
> 
> Date sent:      	Fri, 13 May 2005 00:19:59 -0400 (EDT)
> From:           	Arthur Flexser <flexser at fiu.edu>
> To:             	CoCoList for Color Computer Enthusiasts 
> <coco at maltedmedia.com>
> Subject:        	Re: [Coco] replacing main rom
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> > Actually, at the fast timer rate, the blink rate does get so fast as
> > to be practically unnoticeable, as I recall;  the characters just take
> > on a slight flickering quality.  (The blink rate would be around 2
> > msec, which would indeed be too fast to see, but the flicker may
> > result from some sort of occasional synchrony with the 60th of a
> > second vertical refresh.)  You may well be right that the 12-bit timer
> > and the blink attribute timer merely overlap rather than being
> > entirely the same thing.
> > 
> > Art
> 
> 
> 
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