2 replies to this topic

[jbs30000]

I know that the reason that the playscreen is in ROM was to free up RAM for player2-5 x and y positions, COLUP, NUSIZ, and other values. But after all that, are there any RAM locations that aren't used? I know that there are the temp variables, but I want, if possible, something more permanent.

I noticed in the memory map here
http://www.randomter...html#memorymaps
$FA-FF aren't labeled. Are they stack variables also, or are those free to use? Thank you.

[batari]

jbs30000, on Sat May 10, 2008 1:58 AM, said:

I know that the reason that the playscreen is in ROM was to free up RAM for player2-5 x and y positions, COLUP, NUSIZ, and other values. But after all that, are there any RAM locations that aren't used? I know that there are the temp variables, but I want, if possible, something more permanent.

I noticed in the memory map here
http://www.randomter...html#memorymaps
$FA-FF aren't labeled. Are they stack variables also, or are those free to use? Thank you.

"playfieldpos" ($C3) is not currently in use, but it is reserved for future use (will be used for vertical scrolling if I get around to implementing it.) If you plan to use the existing kernel, you can use it, however.

$FA-$FF are reserved for the stack. I wouldn't use them unless you know what you are doing.

[jbs30000]

Ok, I figured that they were probably used for the stack. I'm glad that there is an extra variable I can use though. Thank you.