what a new compiler's orders are

[codeferever]

Hello!Today I have scaned one of my friend's book about 80c51.And a  problem comes to me that why there is a "acall myfunc" but not a "call". Well,he using KEIL,not nasm(maybe he will download one as I suggested him  ).
I wonder if there are some formats and directives defined by intel and all the some between nasm,masm,as86 or keil...
How could I know what a new compiler's orders are ?

[Frank Kotler]

Read the manual?

Nasm targets the 80x86 architecture - won't help your friend with his 80c51, I'm afraid. Keil won't even tell you the price for their assembler, you have to request a quote. That puts it out of my price range! Typing "80c51 assembler" into Google comes up with some free ones...

Sounds like an interesting chip, but Nasm won't work on it.

Best,
Frank

[codeferever]

Thank you,Frank!
well,when I was reading bootsect.s of linux0.12,I have always found such directives as
"rep movw",
"seg fs",
"lgs si,(bx)",
"j load_setup"

I don't know if these directives can also be effective for nasm?
 Or which part of nasm manual can clarify the puzzling problems? 

[Keith Kanios]

well,when I was reading bootsect.s of linux0.12,I have always found such directives as
...
I don't know if these directives can also be effective for nasm?
 Or which part of nasm manual can clarify the puzzling problems? 

Wrong assembler... that is AT&T syntax ala GAS.

[Frank Kotler]

Actually, I think it's as86 syntax - kind of a weird hybrid of Intel and AT&T. Not for Nasm, in any case!

"rep movw", -> "rep movsw"
"seg fs", -> just "fs" probably?
"lgs si,(bx)", -> "lgs si, [bx]"
"j load_setup" -> just "jmp", I would guess (maybe "jmp short"?)

Some "context" might help - we know what a bootsector "has to do", even if the syntax is unfamiliar. Got a link to the exact "bootsect.s" you're looking at? (save us looking it up...)

Best,
Frank