Pixels in the atari 2600

[aldir]

Hello guys,

 

I’m a new member in this forum and don’t write English correctly. I hope that you understand. The sites about the Atari2600 in my language is very bad (like my English). Here Andrew Davie and Kirk Israel are very famous persons!

 

Ok… the problem is:

Assuming that we are writing pixels in a background, if in each clock of the processor we have 3 clocks of color of the TIA, and the color just can be modified later that the processor to rewrite in colubk, then we will have at least 3 "pixels" of the same color connected in a line. is this correct? if this is right, the resolution does not fall?

Edited May 9, 2005 by aldir

[Cybergoth]

Hi there!

 

Assuming that we are writing of pixels in a background, if in each clock of the processor we have 3 clocks of color of the TIA, and the color just can be modified later that the processor to come back, then we will have at least 3 "pixels" of the same color followed in a line?  if this is true, the resolution does not fall?

852216[/snapback]

 

Uhm... sort of. Since any write to the background color register like

 

STA COLUBK

 

will require three 3 processor cycles, you actually can change the color even only every 9 pixels.

 

With A,X & Y containing 3 different values, a repeating sequence of

 

STA COLUBK

STX COLUBK

STY COLUBK

 

can do a max of 17-18 background color changes on a single scannline.

 

Not sure what you're asking in the part about the resolution here. There actually is no resolution for background color changes. Just depends on what you programm...

 

Greetings,

Manuel

[aldir]

852216[/snapback]

 

Uhm... sort of. Since any write to the background color register like...

 

852222[/snapback]

 

 

Do you speak portuguese, no???

[Cybergoth]

Hi there!

 

Sorry, I don't. I think there's a 2600 programming forum in portuguese somewhere within yahoo groups, maybe they can help?

 

Greetings,

Manuel

[Thomas Jentzsch]

Sorry, I don't. I think there's a 2600 programming forum in portuguese somewhere within yahoo groups, maybe they can help?

Or check the International forum here at AtariAge.

[aldir]

No problem, I can understand all that you write (I can read, but the problem is write).

 

The answer of Cybergoth already helped me.

 

The fact is: we can do a max of 17-18 background color changes on a single scanline…

 

That I tried say with "resolution" was that if the number of variation de colors in a scanline decrease, the shapes drawn seem in a lesser resolution (more squared).

 

I hope that you understand some thing.