Picasso IV Chip Upgrades

[MastaTabs]

yes, you're right alex,

the bridge wont change a thing about the flifi.

he could try and open or close jp3 and jp5 to change the flifi timing strategy and force a 12bit FliFi.

regs
Tobias

[MastaTabs]

I don't think this is related to the color palette being degraded. How are you're jumper settings now ? Default would be JP3 closed and 4 and 5 opened.

Maybe there are some problems with the 28MHz clock on your VideoSlot. I had a customer with a 4000T once that didn't provide the clock at all. Result was a black screen when using an Amiga native screen mode.

Musn't have to be like that but possible.

What type is the 16V8 GAL on the card ? AMD Lattice ?

[MastaTabs]

Can be everything from chip tolerances to slightly corroded pins.

First thing I'd do is to remove the MACH220 and the GAL16V8 and clean the pins by rubbing them on some clean paper and then reseat them properly into the sockets.

BE CAREFUL!! Use the right tools for removal to not crack the sockets.

Also clean the video slot edge connector on the card and the connector socket on the A4000s daughter card.

Those would be my first steps.