Re: Apple ][+ with double vision

[Rob <char27@gmail.com>]

On Dec 7, 9:08 am, dog_...@macgui.com (D Finnigan) wrote:
> Robwrote:
>
>
>
> > On Dec 7, 7:57 am, Geoff Body <gbo...@bigpond.com> wrote:
> >> Rob,
> >> based on your description I would consider either E11 or D12 as
> >> possible faulty parts.
> >> You could swap E11 & E12 and see if the problem changes to a
> >> horizontal duplication every 8 characters.
> >> This would show if the 74LS153 is faulty.
>
> >> Geoff
>
> > Hi Geoff,
> > Thanks for the reply and suggestion...
> > I am not familiar with what parts/chips you are referring to as I have
> > not yet had to deal with the A2 board directly except adding/removing
> > RAM :)  Can you or someone refer me to a schematic that has info on
> > where these are on the board?
>
> There should be a grid on the board, so E11 & E12 are the locations. You
> should see lettering on one edge and numbering on another, just like on a
> map.

Thanks! - I will give this a try and post my results.