Re: Weird video on Apple IIc

[drsmooth@relex.com (Edhel Iaur)]

macrl@pantheon.yale.edu (Ryan L Macarthur) wrote:

>It's the normal "Apple //c" screen when the power's 
>turned on, but there are a couple of rapidly blinking @ symbols staying 
>in the same place on the screen.  After the disk drive reads the first 
>track or two on any disk I put in and crashes out (for example, the ProDOS 
>1.0.1 or "David-DOS" header will appear on the screen, and then the drive 
>starts screaming bloody murder... I'm thinking maybe it's the drive, 
>maybe it's another symptom of a deeper problem, I can't tell until I hook 
>up an external drive and try booting off that), the symbols are still there, 
>and when I hit CR the @ symbols start forming a column up the screen:

>               @
>               @
>        @      @
>        @     
>        @      @
>        @      *
>        @
>        *

>where the *'s are the rapidly flashing @ signs, and the ones that scroll 
>up the screen are normal.  Applesoft BASIC seems to work fine, and as the 
>screen is filled with text, text that is scrolled up past the flashing 
>@'s will be changed to a different character.

Since they form those lines, it seems like the ROM text routines (COUT
and its close friends?) are taking those @s into their folds...Maybe
somethin's wrong with your EF ROM? (A chip in the //e...in the //c it
may be consolidated with the CD ROM, forming a CF ROM?)  Maybe all it
(and the other chips in your //c) just needs to be re-seated?
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