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James Gregory 2013-12-31 11:06:31 +11:00
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@ -62,9 +62,14 @@ I'm sure Richard is right when it comes to the real McCoy IBM VGA and
EGA, but I'm less confident that every clone out there loads the start
address at the start of vertical sync.
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![](images/i.jpg) *For that very reason, I generally advise people not to use horizontal smooth panning unless they can test their software on all the makes of display adapter it might run on. I've used Richard's approach in Listings 30.1 and 30.2, and so far as I've seen it works fine, but be aware that there are potential, albeit unproven, hazards to relying on the setting of the start address registers to occur at a specific time in the frame.*
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> ![](images/i.jpg)
> For that very reason, I generally advise people not to use horizontal
> smooth panning unless they can test their software on all the makes of
> display adapter it might run on. I've used Richard's approach in
> Listings 30.1 and 30.2, and so far as I've seen it works fine, but be
> aware that there are potential, albeit unproven, hazards to relying on
> the setting of the start address registers to occur at a specific time
> in the frame.
The interaction of the start address registers and the Pel Panning
register is worthy of note. After waiting for the end of vertical sync