im using fasm (flat assembler 1.68), and im trying to output a string with int21h/ah=09h
jmp main
msg db "hello world$"
main:
mov dx, msg
mov ah, 09
int 21hthis code outputs "hello world", but it outputs some control characters before it ([SOME WEIRD CONTROL CHARACTERS]hello world)
so how can i fix this?
Jump to PostStrange.
Presumably DOS, or you'd get nothing.
I notice the lack of a return statement. The control chars may appear at the beginning of the line, but that doesn't mean they were printed before your message. You might be running past the end of your program, and hitting …
Jump to PostHmmm... not a fasm user, so just some other observations. No org statement, or use 16 statement. Thought fasm syntax was a dollar symbol before hex numbers, but that may be optional. Some assemblers need exe2bin to fix linkage of programs. Maybe give us the whole program and the process …
Strange.
Presumably DOS, or you'd get nothing.
I notice the lack of a return statement. The control chars may appear at the beginning of the line, but that doesn't mean they were printed before your message. You might be running past the end of your program, and hitting something that moves the cursor, then prints who-knows-what.
Also, I don't see any segment setup, so this is a com program?
Strange.
Presumably DOS, or you'd get nothing.
I notice the lack of a return statement. The control chars may appear at the beginning of the line, but that doesn't mean they were printed before your message. You might be running past the end of your program, and hitting something that moves the cursor, then prints who-knows-what.
Also, I don't see any segment setup, so this is a com program?
yes its DOS, and yes its a com program. And that was only part of the program.
even if i put
mov ah, 4Ch
int 21hor 'ret'
i still see control characters before my message
Hmmm... not a fasm user, so just some other observations. No org statement, or use 16 statement. Thought fasm syntax was a dollar symbol before hex numbers, but that may be optional. Some assemblers need exe2bin to fix linkage of programs. Maybe give us the whole program and the process you follow and it could attract a solution.
Actually, it's so short, a dir listing of executable (so we see file size) and use debug to dump the contents, and post it here.
Hmmm... not a fasm user, so just some other observations. No org statement, or use 16 statement. Thought fasm syntax was a dollar symbol before hex numbers, but that may be optional. Some assemblers need exe2bin to fix linkage of programs. Maybe give us the whole program and the process you follow and it could attract a solution.
Actually, it's so short, a dir listing of executable (so we see file size) and use debug to dump the contents, and post it here.
Heres the disassembly:
1462:0100 EB0C JMP 010E
1462:0102 68 DB 68
1462:0103 65 DB 65
1462:0104 6C DB 6C
1462:0105 6C DB 6C
1462:0106 6F DB 6F
1462:0107 20776F AND [BX+6F],DH
1462:010A 726C JB 0178
1462:010C 64 DB 64
1462:010D 24BA AND AL,BA
1462:010F 0200 ADD AL,[BX+SI]
1462:0111 B409 MOV AH,09
1462:0113 CD21 INT 21
1462:0115 B44C MOV AH,4C
1462:0117 CD21 INT 21
1462:0119 0200 ADD AL,[BX+SI]
1462:011B B409 MOV AH,09
1462:011D CD21 INT 21
1462:011F B44C MOV AH,4C
-u
1462:0121 CD21 INT 21Ha! Isn't funny how we overlook the obvious? When you pointed DX at 0002, you forgot that your program actually loads at 0100. Just change
MOV DX,0002to
MOV DX,0102BTW, here's how to use debug to get a decent listing (ok, pathetic listing, but we're using "debug")
-u100,101
139A:0100 EB0C JMP 010E
-d102,10d
139A:0100 68 65 6C 6C 6F 20-77 6F 72 6C 64 24 hello world$
-u10e,122
139A:010E BA0200 MOV DX,0002
139A:0111 B409 MOV AH,09
139A:0113 CD21 INT 21
139A:0115 B44C MOV AH,4C
139A:0117 CD21 INT 21
139A:0119 0200 ADD AL,[BX+SI]
139A:011B B409 MOV AH,09
139A:011D CD21 INT 21
139A:011F B44C MOV AH,4C
139A:0121 CD21 INT 21thanks, turns out i should of had an org statement in the first place
need code snake game
run emu8086
Hi, I'm trying to print the $ character. I tried putting a "\" but it didnt work..
Any idea??
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