org 400h
START MOV AL, 1
OP: OUT 0, AL
ROL AL, 1
CALL DELAY
DELAY: MOV CX, $000H
loop$
RET
I'm trying to convert asm to hex using the code above on NASM using this line:
nasm -f ith test.asm -o test.hex
But I'm getting this error:
test.asm:9: error: expression syntax error
test.asm:10: warning: label alone on a line without a colon might be in error [-w+label-orphan]
The error you are encountering is due to the incorrect syntax in your code. The NASM assembler is expecting a valid expression after the `CX` register name in the `MOV` instruction.
To fix the error, you need to provide a valid expression. In this case, you can replace `$000H` with `0` to represent the hexadecimal value of zero. Here's the updated code:
```
org 400h
START:
MOV AL, 1
OP:
OUT 0, AL
ROL AL, 1
CALL DELAY
DELAY:
MOV CX, 0
loop$:
RET
```
After making these changes, you can try running the NASM command again:
```
nasm -f ith test.asm -o test.hex
```
This should convert your assembly code into a hexadecimal file named `test.hex` without any errors.
The error you are encountering in your assembly code is due to the incorrect usage of the RET instruction within the DELAY subroutine. The RET instruction should not be used by itself.
To resolve this error, you can update your code as follows:
```
org 400h
START:
MOV AL, 1
OUT 0, AL
ROL AL, 1
CALL DELAY
DELAY:
MOV CX, 0000H
loop$:
LOOP loop$
RET
```
After making these changes, you can try converting the assembly code to a hex file using the command `nasm -f bin test.asm -o test.hex`.