Re: commdore screen text / graphic mode

I did a bit of analysis on this last year when I was working out the 
refresh rates on various CRTC PET's. I looked at all the edit roms on 
zimmers and put all the CRTC initialisation registers into a s/sheet. 
You can get it here:

http://inchocks.co.uk/commodore/PET/PET_CRTC.xls

THere's two rows for each ROM, being the initialisation registers for 
text and graphics modes respectively. As Martin said, it's usually 2 
except for one alternate version of the 901474-04 rom which had only 1 
extra scan line.

Rob


On 14/11/2012 23:11, didier@aida.org wrote:
> Hi,
>
>   
>
> Apparently on the commodre 8000 the font displayed is 8x8 but apparently some blank lines can be added in “text” mode
>
> Do you have any idea on the exact number ?
>
>   
>
> The data in the register of the 6545 is 9 in text mode and 7 in graphic mode…
>
>   
>
> Is there 1 or 2 blank lines ?
>
>   
>
> I don’t remember very well….
>
>   
>
> Thanks
>
>   
>
> --
>
> Didier
>
>   
>
>   
>
>


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