Illegal Memory Access
KierhamSoftware 2020-10-27 20:32 (Edited)
I know what that error means, but why am I getting it?
I can't show you the program because I need a screenshot and I can only get a screenshot on mobile and this site doesn't work on mobile so here is the code. Paste it into Notepad++ or something
Press a. That is what I’m having problems with.
GAMEPAD 1
SELECT=0
SELECT2=0
ROCKS=0
X=0
Y=0
BG 1
CELL SIZE 1,1
DO
BG SOURCE ROM(4)
BG COPY SELECT,SELECT2,20,16 TO 0,0
SELECT=INT(X/8)
SELECT2=INT(Y/8)
IF LEFT(0) THEN DEC X
IF RIGHT(0) THEN INC X
IF UP(0) THEN DEC Y
IF DOWN(0) THEN INC Y
IF X<0 THEN X=0
IF Y<0 THEN Y=0
IF X>407 THEN X=407
IF Y>455 THEN Y=455
IF BUTTON TAP(0,0) THEN
FOR I=1 TO 7
FOR I2=1 TO 10
IF CELL.C(I2,I)=10 THEN
PRINT "GOT ROCK"
INC ROCKS
MCELL I2,I,40
END IF
NEXT I2
NEXT I
END IF
WAIT VBL
LOOP
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GAMELEGEND 2020-10-28 00:27
strange
i ran this have no errors
GAMELEGEND 2020-10-28 00:30
to get a screen shot on lowres windows version
use ctrl + s
KierhamSoftware 2020-10-28 00:33
Oh I forgot, you press A to collect any materials on screen (so far I only have rock)
GAMELEGEND 2020-10-28 02:07 (Edited)
okay so the problem is
you are usin MCELL when the BG SOURCE is not in working RAM
usin BG SOURCE ROM(n) uses a map from ROM ENTRY n(which in this case is 4)
but if you used somthin like BG SOURCE $A000 it uses a map from workin RAM
unfortunately i can not tell you any more because that is the all my current knowledge of working RAM
was8bit 2020-10-28 07:24
The steps are this...
1) copy your entire game map that you made from FILE to ACTIVE MEMORY
2) tell NX that your background source is now ACTIVE MEMORY
was8bit 2020-10-28 07:28
When the game is playing, you
1) update your visible Bg layer as normal
2) you must then also update the map stored in ACTIVE MEMORY using the X,Y location of the item on the screen PLUS the X,Y of the upper left used in the BG COPY command
was8bit 2020-10-28 07:29 (Edited)
I took the liberty to use a SUB to simpify the movement code :)
I also placed map on BG layer 1, and the feedback text on BG layer 0 (#0 is actually on top of #1)
KierhamSoftware 2020-10-28 15:56
There are 2 rows missing of bg missing
KierhamSoftware 2020-10-28 15:58
I fixed the problem by changing 7 and 9 to 8 and 10 in my program and was8bit’s sub program
was8bit 2020-10-28 19:15
Ah, nice catch :)
was8bit 2020-10-28 19:18
The SUB I made wasn't really necessary... it's just a habit I do, because if you get a TON of code written all smoothed together it can get really confusing, especially if you don't work on the code all at once... when you leave it for a week or month, long smoothed code gets tossed away and abandoned because it takes too much effort to figure out what you were doing...
The more organized and such, the better in the long run, for me anyways :)