ansk@hotmail.com

Hello kenjennings, Thanks for this clarification, in particular about the horizontal indent, I always wondered why it was like that on the Atari. I am very much retro in my thinking, trying to do things in a way that take into account technical conditions and criteria given by yesterday's TV/monitor standards. I have no purpose other than perception and feel, want it to be really old style. BR, Anders

Hi there Synthpopalooza, Thanks for contributing to this discussion. BR, Anders

Hello Rybags, OK, so I confused rankings with names. I thought I should use what I call the default display list and modify it in a coordinated way to be sure I preserve the dimensions of the screen, which in turn is because I wanted to write an all screen compatible program. However after reading comments from yourself and from MaPa, I understand I need not add 8 and subtract 8 from the net screen dimension, I can add 8 and subtract 4 to keep it centerred vertically. Your advice has been of great help and I will share the result here later, if I ever finish this mini project. BR, Anders

Hello Quadrunner and Dragonstomper, Thanks for replying so quickly and I am sorry, I described too little of the context of my need for this. This is for a machine code program to fit on a 16 KB RAM Atari. I currently have 40 x 24 = 960 bytes of screen memory in the address range to 15424. Below that, from 15392 to 15423 the 32 bytes long display list. I understand if I expand the screen to 40 x 25 it will be 1000 bytes and then it would be allocated to address interval 15384 to 16383. The display list on 15352 to 15383 would then need to modified to generate one less of the blank lines and one more of text lines, according to the original posted data. However my concern is, will it with regard to PAL/NTSC/whatever compatibility be OK to remove one of the 112s and add a 2? That I think expands the text screen at the top. Is it otherwise OK to add one at the end of the text screen? This could be considered from a basic compatibility point of view, but also as an aestetical issue. Will it work on all markets and does it look good? Again, I apologize for referring to Atari BASIC without clarifying I just meant the ANTIC mode, not the Atari BASIC environment itself. BR, Anders

I want to expand the number of displayed (Atari BASIC) GRAPHICS 0 text lines from the default value 24 to 25. Screen size 40 x 25 suits my needs better than 40 x 24. The default display list looks like this expressed using decimal notation: 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, 2,65, 32, 156 I guess I can remove one of the 112s and add an extra 2, like this, to get my 40 x 25 text mode: 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, 2,65, 32, 156 Is this the best way of doing it without violating any PAL/NTSC/whatever compatibility? My understanding is the worst thing that can happen is that on old TVs with rounded corners, the border of the 40 x 25 area may look a little rounded. Is there any preferred alternative to the modification I suggested above? For example, is it for any reason better to keep the three 112s and add an extra line at the bottom? BR, Anders