effectus with dl

[funkheld]

Hi good afternoon.

Who can explain this to me from effectus :

byte array ndl = [112 112 112 66 64 156 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 86 216 159 65 32 156]

 

from fs.eff

 

thanks

greeting

Edited November 7, 2019 by funkheld

[tschak909]

that's a replacement display list, with the values in decimal. If you change those to hex, and look at a display list chart, they'll make a lot more sense.

-Thom

[funkheld]

Hi, Thank You.
I did not write that.
I would like to know what exactly is done there.
I'm not going through it.

thanks.
grudd

[greblus]

1 hour ago, funkheld said:

I would like to know what exactly is done there.

Hi.

 

It think I was reading this great book at that time: https://www.atariarchives.org/agagd/chapter2.php

 

[112 112 112 66 64 156 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 86 216 159 65 32 156]

        112	Blank 8 scan lines to provide for overscan
	112
	112
	66	\Display ANTIC mode 2 (BASIC 0) 64+2
	64	|Screen memory starts at
	156	/64+156*256 =40000
	2	\Display ANTIC mode 2 for second mode line
	[...]

64 (jump to address) + 6 (GR.1) + 16 (hscrol on) = 86

        65	\JVB-Jump and wait for Vertical Blank
	32	|to display list address which starts
	156	/at 32+256*156=39968

My idea was to change the address of this GR. 1 line during vertical blank interrupt, directly in

the display list memory, when fine scroll is finished so that it'd give smooth horizontal scroll.

 

Cheers,

W.

[funkheld]

hello, , thanks for the info.

 

greeting.