Question

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]

Answer 1

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.