1024x768 x 24 not possible on Cybervision64 ?!

[Jose]

Hi. Just got it from the post yesterday and set it up using the supplied floppy. It's probaby a very old version of CybergraphX.
1024x768 at 24bit mode simply doesn't exist in the list of screenmodes.
 I'm not gonna mess more with it now cause it's the end of the year but I leave this here for suggestions.

:pint: :pint: :pint:
:pint: :pint: :pint:

[Jose]

@dnelsonfl
All the sockets are filled. It must be the 2MB version upgraded to 4MB.

@Piru    
The version of Cybergraph I installed (from draconian times) has a program called CyberMode or something.
I tried it today and managed to create a mode that worked, but above 55Mhz the screen get's messed up.

Anyone managed an higher frequency? 55Mhz is to flickey to me.
Maybe I should try CGX 3.x or Picasso ?

[Jose]

@AMIGAZ

Well, I can't try it right now cause I have only one monitor and not enouph space near it for two computers and it's a mess to switch the A4k and the PC all the time, but I can guarantee you that mine gets much more than 55Hz at 1024x768 x16. It actually even gets around 70Hz at the next higher resolution IIRC.

Maybe the monitor also takes part in the equation. Mine is a 19"Nokia 446Pro wich has an absolutely cool image. I had to get into service menu to raise color intensity a bit though.

Anyway, next time I use the A4k I'll take note at the working resolutions and frequencies.

[Jose]

Ok I finally done it, here are some of the tested frequencies using a Buster 9 (if it has anything to do with it anyway..).

For some modes I lowered the Sync Lengths the lowest possible to be able to raise the frequency a bit. I don't know if all monitors will accept these. Values presented are the best I could get for these modes but I can't remember if I tryed to lower the sync legnths when the attained frequency was already high. I only present the synch lengths for the 1024x768 and 800x600 modes, both at 24bit.  
Pixel clock also had to be adjusted cause above certain levels image gets messed up.  Pulse offsets didn't make any difference so I kept them under normal values (just clone an existing mode and use it's values)

800x600 24bit:
Scan Mode- Normal
Pixel Clock- 55
Sync Lenghts:
Horizontal- 232(doesn't allow less)
Vertical- 47 (maybe less is possible to raise frequency didn't try)
Frequency- 82,37Hz :-)
NOTE: WHEN THINGS MOVE IN THE SCREEN I GET THOSE ARTIFACTS SOME OF YOU MENTIONED BUT NONMOVING PICTURES ARE PERFECT.
TO TAKE THEM OFF I HAD TO lower the pixel clock to 32 wich resulted in 49,85Hz (You might want to try to lower the vertical sync length)

1024x768 24bit:
Same values but lowered the synch lengths to maximum: 232(doesn't allow less)  and 12 (less would make the picture disappear), for horizontal and verticall ones respectivelly.
Frequency- 56Hz


16bit Modes:
NOTE: I didn't had any of the mentioned artifacts that I got when moving things around the screen with 24bit.

1024x768
Other values as previous mode. Pixel clocks maximum value is 107 otherwise picture gets messed up.
This resulted in 88.54Hz.

@1152x864:
Other values as previous mode:
Frequency- 72,4Hz

1280x1024
..
- 57Hz

1400x1100
-49hz