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1. • 1: CommentAuthorw1k
   • CommentTime28 Aug 2010 20:08 zmieniony

    
   hello, i learn pmg.. lot o them i understand, but some things are unknown from me..
   
   

   1 RAMTOP=106:REM OS top of RAM pointer
   2 PMBASE=54279:REM ANTIC player-missile RAM pointer
   3 SDMCTL=559:REM Shadow of DMACTL
   4 GRACTL=53277:REM CTIA's graphics control register
   5 HPOSP0=53248:REM Horizontal position register of P0
   6 PCOLR0=704:REM Shadow of player 0 color register
   10 GRAPHICS 0:A=PEEK(RAMTOP)-16:REM Must back up for 1-line resolution
   20 POKE PMBASE,A
   30 MYPMBASE=256*A
   40 POKE SDMCTL,62
   50 POKE GRACTL,3
   60 POKE HPOSP0,102
   70 FOR I=MYPMBASE+1024 TO MYPMBASE+1280
   80 POKE I,0
   90 NEXT I
   100 POKE PCOLR0,140
   110 FOR I=0 TO 15
   120 READ X
   130 POKE MYPMBASE+1100+I,X
   140 NEXT I
   150 DATA 14,29,24,24,24,24,24,24
   160 DATA 24,24,24,24,24,24,184,112
   170 ? " ":REM Clear screen
   180 POSITION 15,6
   190 ? "xdx"
   

   
   
   1-60 OK
   70 - why 1024 to 1280?
   130 - what do this line
   
   other lines is ok, i understand them..
2. • 2: CommentAuthorbob_er
   • CommentTime28 Aug 2010 20:08 zmieniony

    
   70 - player 0 memory area (256 bytes beginning from pmbase+1024 in one line resolution).
   130 - somewhere in player 0 memory area are data located. each player uses 256 bytes for shape (8 pixels (1 byte) wide, whole screen height - not all are visible).
3. • 3: CommentAuthorw1k
   • CommentTime28 Aug 2010 20:08

    
   @bob_er thank you, now is the best way for understangint pmg more.. :)