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Old 15 March 2010, 23:04   #1
copperkid
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Picasso IV problems, messed up screen

Hi all, eventually I got my Picasso IV today, bought on ebay before I knew amibay existed

Installed without problems on my A4000/40 (kickstart 3.1, no add-on cards).

The onboard scan doubler/flicker fixer seems to work fine, I can enjoy every classic screen resolution on my old CRT monitor (that starts sync-ing at 30KHz), that's good news, I won't need a new monitor for the time being.

Now let's go to the bad news, and why I'm posting:
the highest Picasso IV mode I can use correctly is 800x600, 256 colors chunky mode.
If I go above that I start to have strange problems.
Basically the static screens look fine, both the workbench one and the test modes in the Picasso control program.
But as soon as I move windows the screen starts to be messed up, icons disappearing, parts of windows that change colors, some times even the mouse pointer totally goes awry.
I can try to take a picture if my description is not good enough.

I'm kind of a "classic" Amiga guy and I bought my A4000 to play around in assembly, so I don't mind that much the messed up 16/24 bits modes, but I was hoping to work on a nice 1280x1024 workbench at least... not that the workbench looks that bad anyway at 800x600 @80Hz compared to the ol' days on a TV set

What do you think guys, what can the problem be?
I believe it's some kind of memory issue, but shouldn't a 1024x768, 4 colors mode use less memory than a 800x600, 256 colors one?
Or the number of color is only an artificial limitation reported to the OS and anyway the memory used depends only on the chunky8/16/24 bit mode selected?

Any program that I can use to check the Picasso memory or any other suggestion?

In theory if I get hold of the memory map should be trivial to write a simple memory test program...
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Old 15 March 2010, 23:26   #2
alexh
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Check that you do not have the Zorro II compatibility mode jumper set.

Check your firmware version.
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Old 16 March 2010, 01:31   #3
copperkid
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Jumpers set correctly, firmware version 7.4 (which I believe it's the latest available).

More bad news though: if I use it for a while also the 800x600 mode gets corrupted.

I got the memory map, seems there are two memory banks:
- $41000000
- $40800000
but the second one is reported only by the p4info utility, while the other is given also by the "debug" utility present in the Picasso96 directory.
Tomorrow I'll hack a little memory/read write test...

Any other suggestions?
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Old 16 March 2010, 06:09   #4
rkauer
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Check the physical memory chips after using the board for a while: if one of them feels too way hot, the chip may be busted.

As an advice, put a little heatsink over the GD5446 chip to keep it a bit cooler. May helps with the problem.
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Old 16 March 2010, 11:19   #5
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The best person to ask is Tobias Seiler aka Mastatabs who worked on that card design.
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