I have no idea what as8051 is, or its syntax. You obviously think that it is important.

1. use google to obtain the documentation for as8051.

2. use google to obtain the documentation for ASM51

3. decide which syntax is least brain-dead and write your source in that dialect.

4. write a "sed" script that converts one syntax to the other.

5. add a rule to your makefile that pre-processes your source code to the required syntax.

6. I generally then have a "sed" script that converts any brain-dead error report into something usable.

7. most "make" implementations will drive any command line tools. "sed" removes the pain.

David.