>on my 7300 I had a bad vrambank.
>the screendoor would only show at 256 colours,
>I experimented with shuffling the vram dimms and ended up with just 
>using 3 out of for banks and leaving one of them empty,
>and it worked, a little circuit was blackened,
>so I did not use the bank next to that one - and it worked, of course 
>at a lesser amount of wram - but it worked. nothing wrong with the 
>vram dimm but the bank was bad.

The VRAM banks are as follows:

7200: three sockets; either none, one or three may be filled, no other 
combinations are valid.

Others which have VRAM: four sockets; either two or four may be filled, 
no other combinations are valid.

If you smoked one VRAM position, then only two are usable.

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