[Coco] replacing main rom

Arthur Flexser flexser at fiu.edu
Fri May 13 17:14:15 EDT 2005

I still don't see that as happening.  The character blinks on, then off.  
Persistence causes it to lose very little luminance before it blinks on again.  
The second "on" restores a bit of the lost luminance before the subsequent
"off".  So you get alternating tiny drops in luminance and tiny boosts that will
quickly reach an equilibrium that provides an apparently unwavering character
luminance.  This is just as you see when looking at an incandescent lightbulb
whose physical illumination is wavering at a 60 Hz rate due to the AC, and which
also has "persistence" due to the inability of the filament to cool down and
lessen its light output much in response to a drop in voltage before the voltage
rises again. There's nothing to provide the illusion of a slower blink rate due
simply to persistence.


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

> Art
> we are talking about the same thing from different perspective. 
> What I am saying is that the "apparant" blink rate and not the actual 
> blink rate. Due to the persistance, only about every 10th blink is 
> seen on the screen. The phosphur cannot change fast enough to 
> see the change in every field of the raster scan. 
> james
> On 13 May 2005 at 14:09, Arthur Flexser wrote:
> Date sent:      	Fri, 13 May 2005 14:09:17 -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
> Send reply to:  	CoCoList for Color Computer Enthusiasts 
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> > I disagree.  Putting it in other terms, the persistence should
> > decrease the amplitude of the variation in luminance, without
> > affecting its frequency.
> > 
> > Art
> > 
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