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> DOS > Compile for DOS on Windows? |
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revolution 14 Oct 2016, 01:50
Yes you can assemble .com files. But you can't test DOS programs in 64-bit Windows natively. You'll need an emulator or VM to run the resulting DOS code.
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14 Oct 2016, 01:50 |
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cld 14 Oct 2016, 04:16
Thanks for the info. Yes, I understand I'll need a DOS environment in order to run the DOS code.
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14 Oct 2016, 04:16 |
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revolution 14 Oct 2016, 04:30
The multiseg.asm example file shows some basic syntax for DOS .exe files:
Code: ; fasm example of writing multi-segment EXE program format MZ entry main:start ; program entry point stack 100h ; stack size segment main ; main program segment start: mov ax,text mov ds,ax mov dx,hello call extra:write_text mov ax,4C00h int 21h segment text hello db 'Hello world!',24h segment extra write_text: mov ah,9 int 21h retf Code: ; fasm example of writing 16-bit COM program org 100h ; code starts at offset 100h use16 ; use 16-bit code display_text = 9 mov ah,display_text mov dx,hello int 21h int 20h hello db 'Hello world!',24h |
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14 Oct 2016, 04:30 |
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cld 15 Oct 2016, 04:37
revolution, thanks. I will study these examples. Last night I assembled my first little program, to print all 256 Ascii chars to the screen.
Code:
use16
org 100h
; mov cx,ffh ; put 255 in reg CX [counter] <== next line fixes this
mov cx,100h ; put 256 in reg CX [counter]
mov dl,0 ; put 0 in DL
prints:
mov ah,2 ; print char to screen
int 21h ; execute
inc dl ; increment DL
loop prints ; loop back
;finish
mov dl,0ah ; put line feed in DL
mov ah,2 ; print it to screen
int 21h ; execute
int 20h ; exit
_________________ cld -- rank amateur Last edited by cld on 15 Oct 2016, 20:23; edited 1 time in total |
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15 Oct 2016, 04:37 |
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revolution 15 Oct 2016, 04:54
cld wrote: ... print all 256 Ascii chars to the screen.  |
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15 Oct 2016, 04:54 |
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cld 15 Oct 2016, 20:24
Pesky edge case! Fixed -- thanks!
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15 Oct 2016, 20:24 |
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