Assembly amature question: prog errors

Code:

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....
MAIN    SEGMENT BYTE                      ; ERROR: segment name `BYTE' not recognised
        ASSUME  CS:MAIN,DS:MAIN,SS:NOTHING  ; ERROR: parser: instruction expected
...

jmp    NEAR PTR PROG_START                ;ERROR: comma or end of line expected
...
DTA            DB      1AH dup (?)        ;ERROR: comma expected after operand 1
...
FNAME          DB      13 dup (?)          ;ERROR: comma expected after operand 1
...
VSTACK          DW      50H dup (?)        ;ERROR: comma expected after operand 1
...

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Hi im trying to assemble a prog with above lines and get above commented errors. howto fix thoes errors please. im using NASM but prog is meant to be assembled on TASM.

thx.

Ok well first off it is complaining about the use of "BYTE" so that should be addressed first. Is there a macro or something you need to import? Or does it need to be macroed? Or perhaps the syntax is just different. Believe it or not there is no standard for assembler at all. Everything else is because of the BYTE issue. I have not used NASM before so I can't give you a more specific answer.