8051 microprocessor assembly language code?

i am planning to rotate a unipolar stepper motor using 8051 microcontroller for this i wrote the following assembly language code:

MOV a,#66H
LOOP1:
MOV p3 , a
RR a
CALL DELAY
JMP LOOP1:

DELAY:
MOV r0 , #246
LOOP2:
DJNZ r0 , LOOP2
NOP
RET

Now when i run this code in "Edsim51" it runs properly by setting the update frequency at 10000. And i also created its ASM file using edsim51. But when i try to convert this ASM file into HEX file, using "ASM51" OR "8051 cross-assembler, version 1.2k by MetaLink corporation"
it gives 2 errors
Please tell me what's wrong with the code and suggest changes to the code or the new/alternate code

Don't understand why the NOP instruction is there. Try another x-assembler such as http://plit.de/asem-51/

MOV r0 , #246

I think in asm you need to move a value into a register. ax dx or something.

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