RE: commodore 8000 character size on screen (rectangular or squarre)

From: didier_at_aida.org
Date: Sun, 4 Nov 2012 20:57:52 +0100
Message-ID: <000801cdbac6$ad0354a0$0709fde0$@org>
This how I implemented the commdore sceen on the propeller

80 columns
http://www.cbm8000.com/screen/80col.png

80 columns detail of characters
http://www.cbm8000.com/screen/80coldetail.png 

40 columns
http://www.cbm8000.com/screen/40col.png 

40 columns detail of characters 
http://www.cbm8000.com/screen/40coldetail.png 

I support the change of character set  graphic/business

I also have the secondary screen but I don’t remember
How we selected this secondary screens I just remember they existed...

Any idea ?

Are the characters ok ? (ratio)

I'll made the source code available to all when I'll 
Have finished the debugging

--
Didier



-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de [mailto:owner-cbm-hackers@musoftware.de] De la part de William Levak
Envoyé : mercredi 31 octobre 2012 04:32
À : cbm-hackers@musoftware.de
Objet : Re: commodore 8000 character size on screen (rectangular or squarre)

On Tue, 30 Oct 2012, Gerrit Heitsch wrote:

> On 10/30/2012 09:47 PM, didier@aida.org wrote:
>> Hi
>> 
>> On the commdore 8000  40cols or 80cols  the font size is 8x8
>> 
>> On the 80cols cbm8000 is the character rectangular on the screen  ?
>> 
>> And
>> 
>> On the 40cols cbm8000 is the character square ?
>
> From my recollection (I used a 4032 and a 8032 back then), the 
> characters on the 4032 are square and on the 8032 they are rectangular.
>
> From the way I remember it looks, I'd say they just doubled the pixel 
> clock (and of course the memory access on the screen RAM) on the 8032 
> compared to the 4032.

That's right, but the text mode also puts 2 bit lines between character lines.  Graphic mode leaves out those extra lines. Older PETs without the CRTC do not put in extra lines in either mode.


wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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Received on 2012-11-04 20:00:03

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