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

From: Fred Cisin <>
Date: Mon Jan 26 15:40:28 2004

> > A side effect is "sparkles" on the
> > scren when things are displayed (because both the CPU and video system are
> > referencing video memory at the same time)
> Hot Damn! I like sparkles.

In the mid 1980's, I wrote a TSR (XenoFont-A) to do screen
capture of PC text mode video. Sybex used it for the
illustrations for almost all of their text mode PC books.

It loaded into RAM (TSR), and stayed out of the way of other
programs. But, when a certain (configurable) key was pressed,
it would copy the video into a RAM buffer, and write it to disk
when DOS was stable enough, in order to print it later, using XenoFont-B.

When used with CGA video, there would be a blast of "static"
whenever the screen was savd.

Sybex was very concerned that it might damage the video, etc.
I reassured them that the "sparkles" was:
"just the flash when it takes the picture"

Grumpy Ol' Fred
Received on Mon Jan 26 2004 - 15:40:28 GMT

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