Re: strange cursor... any idea ?

This reminds me of a teletype repair where the ascii characters have a bit
stuck hi ir low.  So, you'd compare the cbm ascii value of the character
you're getting with the character you're expecting.  See if other
characters are impacted to determine the pattern.  Use this info to track
down the fault i.e. which data line is sticking hi or low. Also, is it a
screen ram or general ram issue, you can test for that.

On Thu, Dec 15, 2022, 10:35 AM <didier_at_aida.org> wrote:

> on my 8032 motherboard, I have a strange cursor
>
> blinking 2x2 checker board...
>
> when I replace the ram and rom (except $E000)  with tynemouth ram/rom I
> get the same result
>
> the $E000 is brand new and made with a 28c16 containing Steve's NTSC
> editor...
>
>
> I'm convinced the problem comes from the crtc or the circuitry producing
> the video signal
>
> any idea ?
>
>
> thanks
>
>