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Trap
Registered: Jul 2010
Posts: 223 |
First raster split?
Something that's been on my mind for years ... wonder if I will ever find the answer:
Who did the first real raster split? I did mine in 1987, but I don't think I was the first?
Trap Crap Wrap |
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tlr
Registered: Sep 2003
Posts: 1787 |
Perhaps ABC Crackings Raster Intro? |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
TLR: its not straight :D and not stable :D |
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tlr
Registered: Sep 2003
Posts: 1787 |
Quote: TLR: its not straight :D and not stable :D
It's not straight but I'd say it's, from the viewers perspective, controlled in a stable manner.
It does use an unconventional technique though.
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Simply setting $d020 every 63d cycle (or as often u like) will make a straight split (given the screen is turned off with $d011=0). Making the split not jump around each frame and making the split occur at the same x-position always is what is called a "Stable raster" which I'm sure Trap looks for. |
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Trap
Registered: Jul 2010
Posts: 223 |
JackAsser got it right. I was looking for the first real vertical raster split. |
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Turtle
Account closed
Registered: Jan 2002
Posts: 70 |
Guess in some Anthony Crowther's gamethere was that test pattern like split after pressing restore, back in 1984. |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
Quote: Guess in some Anthony Crowther's gamethere was that test pattern like split after pressing restore, back in 1984.
Yes, in Gryphon |
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4mat
Registered: May 2010
Posts: 65 |
think it's William Wobbler you press restore in. Gryphon's testcard is a bitmap. (press B) |
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LocalH
Account closed
Registered: Jan 2002
Posts: 10 |
IMO, "raster splits" are always "vertical" - since you're splitting the raster mid-line. Otherwise, standard rasterbars would be considered a split, and I don't think anyone with any knowledge whatsoever calls them that =P
Stability is also key, as has been mentioned - anyone can bung together a jittery split that slides around, it takes at least a little bit of skill to make it rock-solid. |
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tlr
Registered: Sep 2003
Posts: 1787 |
The term "split" is used in early books (e.g Mapping the C64) to denote a mid-screen change of a video parameter by using the raster counter.
I'd say "raster split" is/was a fairly common term for usage of normal raster interrupts, especially in the early days.
Remember that there were loads of stuff done before there were any raster bars or vertical splits... |
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