RE: commdore screen text / graphic mode

Thanks all, this is very interesting

 

I can now complete my emulation of the cbm 4000/8000 screen on a propeller

 

Btw:  If someone is interested, I have a set of French eprom using the “commodore” keyboard (derived from the German Keyboard)

           Before the French keyboard was produced by Commodore we had our own set called internally as “Procep Keyboard”

 

Eprom set for the French version of the commodore 8000

Edit :           http://www.cbm8000.com/eproms/az-e-01-$e000.bin 

Charset:    http://www.cbm8000.com/eproms/az-e-01-charset.bin 

Edex           http://www.cbm8000.com/eproms/edex-4-3-$a000.bin   (basic extension added to all commodore 8XXX sold in France

 

--

didier  

 

De : owner-cbm-hackers@musoftware.de [mailto:owner-cbm-hackers@musoftware.de] De la part de A.Fachat
Envoyé : jeudi 15 novembre 2012 06:32
À : cbm-hackers@musoftware.de
Objet : Re: commdore screen text / graphic mode

 

You might look at my analysis of the pet crtc stuff here http:www.6502.org/users/andre/petindex/crtc.html
There also is a more generic page on the crtc on my site. 

The number of rasterlines is indeed the register value mentioned plus 1.

André



Rob Clarke < <mailto:crock@clarke-family.org.uk> crock@clarke-family.org.uk> schrieb:

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 fo
 nt
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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