Assembly program - 16 errors, trying to understand why

MindGames · #1 08-Mar-2008, 15:47

Hello,

I have an Assembly program which my lecturer wrote on the board, which I am sure I wrote down correctly. However I'm using an Assembler called 68000 IDE. When I build thi, I get 14 errors in all, but I don't how to fix them,understand them. Can anyone help me please?

Thanks for any help

Here's the code:

Code:

; Count the number of a's in the input

           ORG $400
           MOVE.L #$FFF0,A7
CR EQU 13
main:      CLR.L counta
           LEA prompt, A0
           JSR printstr
loop       JSR input
           JSR output; echo
           cmp.b #CR, D0
           beq print
           cmp.b #'a', D0
           bne loop
           add.w #1, counta
           bra loop
print      LEA counta, A0
           JSR printstr
           move.w counta,D0
           cmp.w #10, D0
           BEQ ERR
           add.b #48, D0
           JSR output
           JSR exit
err        LEA error, A0
           JSR printstr
           jsr exit

davekw7x · #2 08-Mar-2008, 19:32

Quote:

Originally Posted by MindGames

...Can anyone help me...

That is not very likely without your telling us what the error messages were and what lines they referred to. Even then there's not a really big chance unless someone has that exact same development environment. Maybe...

Regards,

Dave

TurboPT · #3 08-Mar-2008, 21:40

Here's the error list generated by that environment:
http://img238.imageshack.us/my.php?i...kerrorsee3.png

Many of the errors, based on what I can tell, seem related to the JSR instruction(s). No sub-routines seem to exist for those jumps. (unless more code exists that isn't posted)

This is just a start, there might be more.

EDIT:
I did this to reduce the errors to 5: (see the last 5 lines)

Code:

; Count the number of a's in the input
           ORG $400
           MOVE.L #$FFF0,A7
CR EQU 13
main:      CLR.L counta     
           LEA prompt, A0
           JSR printstr
loop       JSR input
           JSR output ; echo
           cmp.b #CR, D0
           beq print
           cmp.b #'a', D0
           bne loop
           add.w #1, counta
           bra loop
print      LEA counta, A0 
           JSR printstr
           move.w counta, D0
           cmp.w #10, D0
           BEQ ERR
           add.b #48, D0
           JSR output
           JSR exit
err        LEA error, A0
           JSR printstr
           jsr exit
printstr   nop
input      nop
output     nop
prompt     nop
exit       nop

The other 5 errors are at lines with the red text, so I'm not sure what to do with them.

Peter_APIIT · #4 23-Mar-2008, 07:58

What is this program all about ?

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Assembly program - 16 errors, trying to understand why

Re: Assembly program - 16 errors, trying to understand why

Re: Assembly program - 16 errors, trying to understand why

Re: Assembly program - 16 errors, trying to understand why