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Re: Help for an old Apple ][ clone
- Subject: Re: Help for an old Apple ][ clone
- From: heliboy2003@yahoo.com.tw
- Date: 15 Jul 2006 21:03:00 -0700
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I don't think it is the RAM causing the problem because TEXT and GRAPH
use different section of RAM. I will say the video address generation
circuits cause the problem you observed. I don't have schematic with me
right now, I can suggest some ICs to replace tomorrow when I go to
work.
txt 寫道：
> Hi,
>
> I have a problem with an old Asem AM64e an italian Aplle II clone.
> Unfortunately today turning it on I discovered a problem on the screen.
> In particular the computer is regularly working, but there are vertical
> sector of the screen which does not display. This both for graphics and
> text. For example in text mode only half of each character is displayed.
>
> I tried to swap between them the ram chip and to reseat all the other
> ICs, but nothing is changed.
>
> Any idea about the cause of this problem?
>
> Thank you in advance
>
> txt