Memoirs of an X register

Still Reading - Player Missile Graphics Stuff

Posted by tschak909, 01 June 2006 · 70 views

Still reading...and I've come across something in De Re Atari that has me a bit curious. I have cross posted this to the forum, but, I am posting it here too for my journal....

In the book De Re Atari, Chris Crawford talks about moving the player vertically through memory. It's very straightforward...

VERTICAL MOTION

Animating this image...

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Reading...

Posted by tschak909, 31 May 2006 · 89 views

Not much accomplished tonight, spent much of my time basically testing out the memory clearing routine, and reading both Atari Roots and De Re Atari, trying to get a handle on the conceptual model of the system. Will try some basic player missile graphics stuff tomorrow night.

-Thom

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Memory Fill Routine

Posted by tschak909, 30 May 2006 · 102 views

After much deliberation, I finally managed to get the memory clear/fill function debugged.

;
; FILL PAGES MACRO
;
; %1 = beginning page to fill
; %2 = number of pages to fill (should be - 1)
; %3 = byte to fill with (e.g. $00)
;
; $CC = 00 for top of page boundary
; $CD = page currently being filled
; $D5 =...

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Flipping through colours.

Posted by tschak909, 29 May 2006 · 98 views

Ok, well, got my memory clearing routine to work properly, was just a few little typos. Basically was very easy. I had decided to make two separate macros that were self contained for clearing single and multiple pages becase the addition of clearing multiple pages was just a few instructions more, and didn't make sense to loop back through re-setting...

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Back to Basics

Posted by tschak909, 25 May 2006 · 79 views

It's so strange to be coming back to this platform, after not seeing it since 1989. I completely missed the eastern european renaissance that occurred in the early to mid 1990s (which is still happening even today.), and am amazed to see just what has been created for the ANTIC based Atari systems since I left.

It seems I am not the only person who has...

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