Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Boot_WB on May 12, 2007, 06:03:40 PM

Title: Switching off CGX output when using native modes
Post by: Boot_WB on May 12, 2007, 06:03:40 PM

Is there a way to "kill" the CGX output of the CVPPC when the OS switches to a native video mode?

I'm seeing if I can get the CV64/3D scandoubler to work with the CVPPC, but when the OS switches to a native screenmode the  CGX screen freezes and remains visible.

Any ideas?

Title: Re: Switching off CGX output when using native modes
Post by: motorollin on May 12, 2007, 06:17:28 PM

I think there's a tooltype or an env variable which tells it whether or not to keep non-visible screens in memory for fast switching. If you turn that off then it might unload the CGX screen from memory and blank the display. Not sure though.

--
moto

Title: Re: Switching off CGX output when using native modes
Post by: keropi on May 12, 2007, 07:59:53 PM

or you can use a patched cgx4 library to control pin13 of the parallel port, so with a transistor u can automatically open/close it...

here is the Multimedia & design monitor switcher that can be controlled in such a way. http://www.mmd-shop.de/m-switch.htm

with this, I have a full auto-switching grex/aga display.

info on the patch is here: http://people.freenet.de/CHRAmiga.de/Monswit.html

Title: Re: Switching off CGX output when using native modes
Post by: Boot_WB on May 13, 2007, 03:05:24 AM

I've got an idea of how to solve this involving sync signals, a single transistor and a small vero board.  :idea:
I think I need to think about it for a bit before reaching for the sodlering iron, as I should have been asleep 3 hours ago.

Title: Re: Switching off CGX output when using native modes
Post by: motorollin on May 13, 2007, 11:47:15 AM

Sounds interesting - keep us up to date :-)

--
moto