[GreenKeys] [Bulk] Machine on auction site

[Chris Elmquist]

On Thursday (06/30/2011 at 02:15PM -0600), Richard wrote:
> 
> > By the way, the keys on this VT05 _are_ green.  Very, very dark green...
> 
> Wow... UV fading or just a result of the acidic treatment from animal
> urine?

It appears to me that they were molded in a dark greenish color.  Very
close to black but not quite.  I'll reconfirm tonight.  It at least
looked that way in the garage.

> > That's interesting and curious.  I'll have to look at the docs to
> > understand what they were doing there.  Probably waiting for the vertical
> > retrace before updating the screen... so that it didn't cause flicker
> > or other video anomalies when updating whatever display memory it has.
> 
> Ah... if it was 60Hz refresh that would make sense.  Come to think of
> it, the docs might have said "60 Hz" and not specifically mains
> frequency.

Could be either I suppose but the key would be that it probably waits
to update the display buffer in gross ways until the video is in the
vertical retrace period.  So, if you send something that causes the
screen to scroll or clears a line, you probably need to insert nulls
to allow the worst case time for it to get to the top of the retrace
interval and do that operation.

-- 
Chris Elmquist