Video "sparkles" (was: Wow, the "killer POKE" works!

From: Fred Cisin <>
Date: Mon Jan 26 20:09:54 2004

On Mon, 26 Jan 2004, jim wrote:
> i guess you could have dumped the flash had you synced your memory
> accesses to the vertical interval?

Absolutely! I could have (and have done so for other programs).
But in this case,

1. I could not get the entire 4000 bytes in a single VBI
on the slower (4.77 MHz) machines.

2. I wanted absolute minimum resident size, since there was no
way to know ahead of time WHAT foreground programs would be run.

3. Once I told Sybex that it was the flash bulb, they were VERY
happy, since it provided a further visual confirmation that the
picture had been taken!

> Also if memory serves you could have swapped the page off visible,
> copied it, and swapped it back and created quite a flash. lots of
> opportunity for mischief.

At least one of the programs that they were trying to illustrate
was already messing with the RAM of other pages, so I thought that
it would be prudent to stand clear.

> > > Hot Damn! I like sparkles.
> > --
> > Grumpy Ol' Fred
> how can that be (grumpy?)

Somebody else wrote the desire for sparkles.

Grumpy Ol' Fred
Received on Mon Jan 26 2004 - 20:09:54 GMT

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