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; dumps VGA 8x8 font to "r.bin"
; written in nasm syntax
; nasm -o fontdump.com fontdump.asm
org 100h ; code starts at offset 100h
use16 ; use 16-bit code
; get pointer to ROM font
mov ax,1130h
mov bh,03h ; 8x8 font
int 10h ; es:bp -> ROM font
; save ROM font to file
push es
mov dx,filename ; ds:dx -> filename
xor cx,cx ; normal attributes
mov ah,3ch ; create file
int 21h
jc fail ; cf = 1 = error
mov bx,ax ; bx = output file handle
mov cx,2048 ; cx = output size
mov dx,bp
pop ds ; ds:dx -> data
mov ah,40h ; write to file
int 21h
jc fail ; cf = 1 = error
cmp ax,cx ; ax = cx -> write ok
jne fail
mov ah,3eh ; close file, bx = outputfile handle
int 21h
mov al,0
jnc exit ; cf = 1 = error
fail:
mov al,1
exit:
mov ah,4ch
int 21h
; data
filename db 'r.bin',0
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