General Category > Amstrad CPC hardware

Multiple CRTC Screens possible or not? and practical or not?

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zhulien:
Hi Everyone,


I know that we have the ability to change CRTC registers part way down the screen to eg: created split screen modes.


Can other CRTC registers also be changed so you effectively have 2 totally independent screens within a single CRTC?


For example, very tall but quarter sized width screens on the left and right?  If that is possible, can it be practical to be two sprites without a background on a non-plus machine with the smoothness of hardware sprites moving the 2 screens around independently?  eg: could you make Way of the Exploding Fist type game using two giant perfectly smooth moving screens?


Perhaps a horizon can be done via rasters to have the largest smooth sprite fighting game ever on CPC?

GUNHED:

--- Quote from: zhulien on 15:20, 20 September 21 ---Can other CRTC registers also be changed so you effectively have 2 totally independent screens within a single CRTC?

--- End quote ---
Yes, that's what I do in 'Return of the Sisters' and 'Gerelakos'. Two 16 KB screens. Well, in my case the get together to one 32 KB overscan screen.

It's also possible to have space in between.

Targhan:
For vertical screen splitting, you can check the venerable SandKoh introduction. However, don't ever try to think you can make a game from this technique... It's simply not practical.

zhulien:

--- Quote from: GUNHED on 01:07, 21 September 21 ---Yes, that's what I do in 'Return of the Sisters' and 'Gerelakos'.
--- End quote ---


Impressive!

zhulien:

--- Quote from: Targhan on 10:10, 21 September 21 ---However, don't ever try to think you can make a game from this technique... It's simply not practical.

--- End quote ---


I was thinking it could be possible to start small, like Atari 2600 small, but with huge smooth sprites (actually movable screens).


Perhaps driving 2 squares around the screen trying to bump the other into the side of the screen? or just damaging them but not yet necessarily having the score or damage displayed while playing?  Each square controlled by a separate player.


I guess the game would be needed to be thought of it fit in with the technique, not the other way around.

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