i recently acquired a quadra 700 that I upgraded with 68mb ram, 2mb vram and a zuluscsi compact, and i'm having a strange issue under 7.6 or 8.1 when running at 640x480 or 832x624 @ 24-bit/"millions of colors", where some icons on the desktop seem to get corrupted - especially the imagewriter icon, but it seems like it can happen to any of them.
If i rename an icon for example, the area where the text overlay used to cover, will turn into rainbow pixels, likewise moving the corrupted icon will often leave a rectangle around where the text box was with the same corruption. Rebuilding desktop doesn't seem to effect anything. Disabling all extensions, likewise has had no effect.
I've tried deoxit on the vram slots, to no avail, the majority of the screen looks fine, likewise it doesn't seem to happen at all in 256 colors or any other mode. I haven't noticed nearly the same issue when running 7.5.x and i presume that it's something introduced in 7.6+ that is pushing it harder? but also wanted to confirm this isn't some known bug - i've seen nothing about this. I've tried swapping the vram around to different slots, although I only have these 6 sticks to play with so I can't rule out VRAM entirely...I've been tempted to buy some more to swap around. However, I figured before I start throwing more money at the problem, I'd make a post here.
The posts I have seen about quadra corruption like this are often answers I am less happy to hear - like ramdac issues or bad traces, however, the board on this looks very clean, no battery leakage or etc. It was pretty dusty when I got it though - including dust in some of the vram slots, I've since deoxit'd both the vram and the slots, running some paper through it as well, which did take off a good amount of gunk. I definitely could try another round of cleaning, but I'm starting to feel that i'm going in circles.
If i rename an icon for example, the area where the text overlay used to cover, will turn into rainbow pixels, likewise moving the corrupted icon will often leave a rectangle around where the text box was with the same corruption. Rebuilding desktop doesn't seem to effect anything. Disabling all extensions, likewise has had no effect.
I've tried deoxit on the vram slots, to no avail, the majority of the screen looks fine, likewise it doesn't seem to happen at all in 256 colors or any other mode. I haven't noticed nearly the same issue when running 7.5.x and i presume that it's something introduced in 7.6+ that is pushing it harder? but also wanted to confirm this isn't some known bug - i've seen nothing about this. I've tried swapping the vram around to different slots, although I only have these 6 sticks to play with so I can't rule out VRAM entirely...I've been tempted to buy some more to swap around. However, I figured before I start throwing more money at the problem, I'd make a post here.
The posts I have seen about quadra corruption like this are often answers I am less happy to hear - like ramdac issues or bad traces, however, the board on this looks very clean, no battery leakage or etc. It was pretty dusty when I got it though - including dust in some of the vram slots, I've since deoxit'd both the vram and the slots, running some paper through it as well, which did take off a good amount of gunk. I definitely could try another round of cleaning, but I'm starting to feel that i'm going in circles.
