Thanks.

Actually i found out that these garbage columns are on invert (a white block
apears). By typing some characters will display the characters inside them
on invert. I assume then that the data store on the RAM are correct (at
least the first 7bits from PETSCII), so it may not be a 2114 problem
afterall. The only invert line is inside the CRTC. I have no clue right now
how inverse characters are generated on the PET, but i think it's safe to
assume, that an address line shorts with the INVERT line from the CRTC,
hopefully not inside the IC... It may be that the inverse logic is stored in
the remaining 48 bytes (4 rams 1kx4=2048bytes, display of 80x25 =2000
characters)?

2009/5/8 <ruud.baltissen@apg.nl>

> Hallo Florian,
>
>
> > The one with an output pin always on high, right?
>
> No. If it was a data line issue, the whole screen would be affected.
> Just a column means an address line is affected. in this case I would
> say A4. And only the upper half of the screen, that means the error it
> is restricted to one pair of 2114's ie. it isn't one of the
> buffers/drivers connected to the 2114's.
> Although it may look like garbage, it should be possible to find out
> whether bit 0..3 or 4..7 are affected.
>
>
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