Re: A big map with scrolling. How???

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2 total messages Started by David Gudeman Tue, 11 Sep 1990 19:30

#935

Author: David Gudeman
Date: Tue, 11 Sep 1990 19:30

16 lines
1231 bytes

In article  <20299:Sep1114:53:0290@kramden.acf.nyu.edu> brnstnd@kramden.acf.nyu.edu (Dan Bernstein) writes:
]... I don't remember the exact dimensions of
]the maze, but it was somewhat wider than the screen and much longer.
]Anyway, scrolling was truly instantaneous: the CGA had something to set
]the byte offset of the screen within its many screenfuls of memory, and
]*blip* everything shifted...

I suspect that you are dis-remembering the dimensions and the actual
width was the same as the screen width.  I don't know of any way to
use this technique with a map width different from the screen width.
But if you do, please describe it.
-- 
					David Gudeman
Department of Computer Science
The University of Arizona        gudeman@cs.arizona.edu
Tucson, AZ 85721                 noao!arizona!gudeman

Re: A big map with scrolling. How???

#936

Author: Dan Bernstein
Date: Tue, 11 Sep 1990 21:23

19 lines
1515 bytes

In article <25223@megaron.cs.arizona.edu> gudeman@cs.arizona.edu (David Gudeman) writes:
> In article <20299:Sep1114:53:0290@kramden.acf.nyu.edu> brnstnd@kramden.acf.nyu.edu (Dan Bernstein) writes:
> ]... I don't remember the exact dimensions of
> ]the maze, but it was somewhat wider than the screen and much longer.
> I suspect that you are dis-remembering the dimensions and the actual
> width was the same as the screen width.  I don't know of any way to
> use this technique with a map width different from the screen width.
> But if you do, please describe it.

I'm quite sure it was wider than the screen (the game would have been
really silly otherwise). The CGA let you set the virtual text screen
width to practically any number. I think small values messed up the
horizontal retrace, but large values were fine.

I'll go find the code if you'd like. (What, don't you have a Technical
Reference from DOS 1.00? Ya know, back in the days when the manual had a
full BIOS listing? [grin])

---Dan

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