Unresulved Symbol mul8

[Primordial Ooze]

When i try to compile my game i get the following error:

 

---------- Capture Output ----------

> "C:\Atari2600\bB\2600bas.bat" C:\Projects\Atari\OpenSourcePong\opensourcepong.bas

2600 Basic compilation complete.

DASM V2.20.07, Macro Assembler ©1988-2003

bytes of ROM space left

2643 bytes of ROM space left

2643 bytes of ROM space left

--- Unresolved Symbol List

mul8 0000 ???? (R )

 

Fatal assembly error: Source is not resolvable.

 

> Terminated with exit code 0.

 

Code:

 rem Open Source Pong
rem an Open Source Pong Remake
rem Updated: Feburary 10, 2008
rem Website: http://opensourcepong.freepgs.com

rem set the rom size
set romsize 4k

rem set kernel options
rem readpaddle - set it so the paddle controlers are read
set kernel_options no_blank_lines readpaddle

rem set an alias for the ball's x velocity
dim ballxvelocity = a

rem set an alias for the ball's y velocity
dim ballyvelocity = b

rem set an alias for the player1's score
dim player1score = c

rem set an alias for the player2's x score
dim player2score = d

rem set player1's inital x positon
player0x = 15

rem set player1's inital y positon
player0y = 45

rem set player2's inital x positon
player1x = 140

rem set player2's inital y positon
player1y = 45

rem set ball's inital x positon
ballx = 80

rem set ball's inital y positon
bally = 45

rem start of the game loop
gameLoop

rem color the background black'
COLUBK = 0

rem set the color of the playfield to white
COLUPF = 14

rem define the playfield
playfield:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
................................
................................
................................
................................
................................
................................
................................
................................
................................
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
end

rem color player 1's paddle
COLUP0 = 14
rem define player 1's sprite
player0:
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
end

rem color player 2's paddle
COLUP1 = 14
rem define player 2's sprite
player1:
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
%00011000
end

rem read paddle 0, use it to position player0x across the screen
currentpaddle = 0

rem draw the game screen
drawscreen

rem set player1's y position to the paddle control's axis
rem multiplied by 2 plus 1
rem player0y = 2 * paddle + 1

rem make sure the player doesn't go off the top screen
if player0y > 153 then player0y = 153

rem make sure the player doesn't go off the bottom screen
if player0y < 8 then player0y = 8

rem redraw the screen
drawscreen

goto gameLoop

 

To test it remove the rem from the following statement:

 player0y = 2 * paddle + 1

 

Thanks,

 

Open Source Pong

Edited February 15, 2008 by Space Xscape

[SeaGtGruff]

--- Unresolved Symbol List

mul8 0000 ???? (R )

"mul8" is used in the multiplication. If you get an error because it wasn't found (i.e., "unresolved symbol"), then you need to add the following line to your program:

 

   include div_mul.asm

Michael

[Robert M]

Try:

 

 

paddle * 2 + 1

[Primordial Ooze]

Try:

 

 

paddle * 2 + 1

 

That worked thanks

[SeaGtGruff]

Try:

 

 

paddle * 2 + 1

 

That worked thanks

In this case it works, because it's "* 2," and multiplication by 2 doesn't require either the div_mul.asm or div_mul16.asm includes. But from a more general standpoint, if you get a compile error that lists "mul8" as an unresolved symbol, then you need to add "include div_mul.asm" to your program.

 

Michael

[Primordial Ooze]

Cool, it's good to know this, Thanks.