Palette switching in Mode 15

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2 total messages Started by David Rushall Mon, 16 Nov 1992 16:55

#528

Author: David Rushall
Date: Mon, 16 Nov 1992 16:55

18 lines
1202 bytes

I have a number of 'Spectrum 512', a 512-colours-on-the-screen picture format
for the Atari ST, which I would like to view on my A5000. The images would
fit on a Mode 15 screen, and could be displayed in all their glory if I had
some code to display a mode 15 screen, with a pallete switch at the beginning
of each scan line.

Would any kind person happen to have some code to display a mode 15 screen
in this way, that they were prepared to let me have? Or even some code to
display 'Spectrum 512' images?

Ideally, the code should work on any Acorn machine (obvious exceptions
disregarded), but if it only works with A5000/RO3.0 then that's good enough.

Any help would be appreciated,
Dave.

PS: If you do send me your code, please be assured I shall not distribute it
further without your concent.

Re: Palette switching in Mode 15

#556

Author: Philip R. Banks
Date: Thu, 19 Nov 1992 07:20

30 lines
1956 bytes

drushall@cs.man.ac.uk (David Rushall) writes:

> I have a number of 'Spectrum 512', a 512-colours-on-the-screen picture format
> for the Atari ST, which I would like to view on my A5000. The images would
> fit on a Mode 15 screen, and could be displayed in all their glory if I had
> some code to display a mode 15 screen, with a pallete switch at the beginning
> of each scan line.

   The spectrum 512 system would better suit a palette switched Mode 12
screen as only 16 colours are ever in use on each scan line.

> Would any kind person happen to have some code to display a mode 15 screen
> in this way, that they were prepared to let me have? Or even some code to
> display 'Spectrum 512' images?
> 
> Ideally, the code should work on any Acorn machine (obvious exceptions
> disregarded), but if it only works with A5000/RO3.0 then that's good enough.

   It certainly wouldn't be hard to do the palette swicthing on any machine
simply by hooking into IOC Timer 1 and using it. I was playing with
implementing a Spectrum 512 picture viewer but ran out of time and interest.

    Philip

--
Philip R. Banks  Syntax: mail < banks_p@kosmos.wcc.govt.nz >            @@@@@/|
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What price the crown of a king on his throne, when you are chained in   @@/---|
the dark all alone? ---A.P.P.                                           @/    |

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