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Apple IIgs' Super Res Locked Up?



    I would like to modify pixel data directly on $2000 through $9CFF on 
bank $E1.  I typed, "C029: C0" to turn on Super Res and "C029:00" to turn 
off Super Res.  I tried either, but it locked up.  The screen switches to 
green and red rows.  I forced to reboot Apple IIgs.
    Do you have idea why it forbids me from doing $C029?  Do you know if 
there is routine to turn on/off Super Res?

Bryan Parkoff