On Thu, 18 May 2000, Derek Peschel wrote:
> No they don't, but they do have a way to achieve a similar effect. (Sellam,
> you might remember that we talked about this when I visted your house last
> September.)
Nope but go on... :)
> Because of the way the bus is constructed, you can read some address or
> other and get the current byte that's being sent to the screen. By itself,
> that won't give you the current screen location, but if you use a series of
> marker bytes in a certain place (and make sure they ONLY appear in that
> place), you can get the screen location. You may be able to store the
> marker bytes in the "holes" in the screen memory map (that don't correspond
> to any pixels).
HMMMMM!
> This trick was described in the magazine _Computist_. There are one or two
> "Best of Computist" books but they are out of print (I passed up the
> opportunity to buy one). However, the magazines themselves have now been
> scanned. Sorry, I don't have the URL.
My subscription start at around issue #27 or something. I tried buying an
entire run from #1 through like 40 or something from someone advertising
them on an apple2 newsgroup but he wanted way too much.
That was an awesome magazine! I learned so many cool hacks from it. I
also had a few things published in it.
I'll have to find the issue with that article and read up on it. Thanks
for the reference.
> Look for "Vapor-Lock". I think the name was created like this: Your
> routine locks onto a certain part of the screen, but it uses fake, or
> vaporous, information about how to do it. The fact that "Vapor-Lock" is
> also a brand of plastic bag is merely coincidental. :)
It's also the name given to a condition your car can get on a hot day (oh
no, now all the gear heads are going to chime in with their explanations
of this).
Sellam International Man of Intrigue and Danger
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Received on Thu May 18 2000 - 19:40:32 BST