New Picasso96Mode Tutorial (AmigaKit Tech Docs)

[patrik]

As the predefined modes in Picasso96Mode are extremely crappy, especially when used with the much more sensitive TFT monitors, I made a little awk script a few years ago which translates X.org/XFree86 modelines to values you enter in P96Mode.

Such modelines can be found for example here.

With this you can quickly setup say a 1280x1024@60Hz(insert: whatever the native res/refresh rate of your monitor is) screenmode with nice standard VESA timings. This is good, as these VESA timings are what all monitors are made to work after and will thus behave at its best when fed with such.

Example usage:

Code: [Select]

patrik@megaburken:~$ echo "ModeLine "1280x1024" 108.00 1280 1328 1440 1688 1024
1025 1028 1066 +HSync +VSync" | ./modeline2P96.awk
Name:                1280x1024
Clock:              108.00 MHz
Interlace:           Unchecked
DoubleScan:          Unchecked

Timings:           Horizontal:        Vertical:
FrameSize                 1688             1066
BorderSize                   0                0
Position                    48                1
SyncSize                   112                3
SyncPolarity         Unchecked        Unchecked
Frequency               64 KHz            60 Hz
(edit:) Apparently I had the wrong polarity of the syncs - seems the logic is the unchecked box equals negative sync...

[patrik]

@wawrzon:
Try the following:

Code: [Select]

Name:                1680x1050
Clock:              147.14 MHz
Interlace:           Unchecked
DoubleScan:          Unchecked

Timings:           Horizontal:        Vertical:
FrameSize                 2256             1087
BorderSize                   0                0
Position                   104                1
SyncSize                   184                3
SyncPolarity         Unchecked        Unchecked
Frequency               65 KHz            60 Hz

[patrik]

Ok, strange though, as the TV/Monitor has no idea wether the mode is 8-bit, 16-bit or 24-bit, all it cares about colour wise is the amplitude on the R, G and B lines, and these doesn't work in another way because of bit depth.

Sounds more like the timings defined for your 8-bit mode differs from the others, or some general issue with 8-bit modes on the Amiga side.