1024x768 x 24 not possible on Cybervision64 ?!

[patrik]

@AMIGAZ:

To get a 16-bit screenmode in 1024x768:

Start CGXMode and select a monitor corresponding to the limitations of yours. If you can find your monitor in the list - select that one, else select "Monitor-85kHz" - that one will allow you to drive the CV64 to the limit, which your 17" Trinitron will have no problems handling.

When that is done, create a new screenmode, select 16-bit as type and then select "1024x768 (75Hz, 60kHz) VESA" from the list of predefined screenmodes and press "Ok". Then save, reboot and voila - you have a 1024x768 screenmode in 16-bit.


/Patrik

[Amigaz]

Thanks for helping me out Patrik  :-)

Only problem is that I have P96 installed right now

[patrik]

@AMIGAZ:

Dude, my thoughts are with you.. creating screenmodes with Picasso96Mode is lethal .


/Patrik

[zipper]

patrik wrote:
 This what is supposed to be max pixelclock for each bit-depth:

8-bit - 130MHz max
16-bit - 80MHz max
24-bit - 50MHz max

..and I would have sworn that cv64, cv64/3D and PIV all were capable for about 135MHz/85 MHz/85 MHz - or was cv64 les capable than the others? Sorry that "Amiga Graphics Boards" site has since long been disappeared.

[patrik]

@zipper:

Yeah, you are right - it's 135MHz at 8-bit. Sounds reasonable as that is what is required for a 1280x1024 VESA speced screenmode at 75Hz.

At 16-bit though, I am certain the max is 80MHz, unless you remove the limits in CGXMode (cant remember the tooltype for that), which will allow to go to 110MHz or something I think, but using a higher pixelclock than 80MHz will drop the cards performance quickly as it will start to cut significantly from the bandwidth supposed to be over for the Trio64 chip and Amiga cpu to draw into the vram.

Btw, 80MHz is just above whats required for a 1024x768 VESA speced screenmode at 75Hz, so it is a reasonable limit.


/Patrik

[Amigaz]

patrik wrote:
@AMIGAZ:

Dude, my thoughts are with you.. creating screenmodes with Picasso96Mode is lethal .


/Patrik

 :-P P96 screenmode settings can keep you occupied for hours and hours.
Have the CGX V4 cd here so I'm thinking of switching to CGX instead.

[zipper]

patrik wrote:
At 16-bit though, I am certain the max is 80MHz, unless you remove the limits in CGXMode (cant remember the tooltype for that), which will allow to go to 110MHz or something I think, but using a higher pixelclock than 80MHz will drop the cards performance quickly as it will start to cut significantly from the bandwidth supposed to be over for the Trio64 chip and Amiga cpu to draw into the vram.

In P96 is a tooltype overclock, which allows 10 MHz overclocking and the default is 85 so you can try 95 on 16bit.
CGX4 has some tooltype which is spelled backwards and tells something about adding cooling to your Permedia -can't remember the exact phrase.
I used just 16bit until CVPPC as 24bit was so hopelessly slow with older cards (except when looking pics required more colours), so the clocks used have slipped from my memory.