search

Wack0 / maciNTosh

PowerPC Windows NT ported to Power Macintosh systems
GNU General Public License v2.0
522 stars 16 forks source link

Glitches out on G3 Blue and White #24

Closed JannGold closed 1 month ago

JannGold commented 1 month ago

image

Goldfish64 commented 1 month ago

What video card/display setup?

JannGold commented 1 month ago

My display is an Acer 1280 x 1024 AL1706. My GPU is a RAGE Pro. image

JannGold commented 1 month ago

Most G3 machines I see have a RAGE 128.

Wack0 commented 1 month ago

This is an ATI Rage DSP timing issue. I know my current dsp timing code for rage (not to be confused with rage 128!) is incorrect and only works on lombard (and on imac G3 with slightly more flickering).

Unfortunately my lombard is currently out of action so i won't be able to test any such code for a while.

Wack0 commented 1 month ago

Also: the screen wraparound at the bottom is interesting. I blindly put the card into 32bpp mode, but open firmware might have set it into a resolution where the card has not enough vram for 32bpp.

In that case, try changing the resolution in the open firmware shell, that might help a bit:

dev screen
show-modes
x set-mode

(where "x" is one of the mode numbers shown) if it powers off the screen, you can still use the OF shell blind for shut-down or reset-all.

JannGold commented 1 month ago

I thought the screen wrap was very weird. I haven’t seen it before on that Mac or my monitor.

JannGold commented 1 month ago

Solved! My monitor was 5:4 ratio. I tried a Dell 4:3, and it worked!