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> DOS > bitmaps of ascii characters |
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Picnic 11 Dec 2007, 19:19
Hello,
How to find the bitmaps of ascii characters in memory? |
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11 Dec 2007, 19:19 |
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edfed 11 Dec 2007, 20:53
what you want is this?
FFA6:000E rom graphics character table? |
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11 Dec 2007, 20:53 |
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Picnic 11 Dec 2007, 21:58
Hi edfed, I can't figure out what registers should i use, is this for 8x16 font?
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11 Dec 2007, 21:58 |
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sinsi 11 Dec 2007, 23:17
Quote:
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11 Dec 2007, 23:17 |
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edfed 12 Dec 2007, 03:28
to see what is the font from rom bios
Code:
org 100h
mov ax,13h
int 10h
mov ax,0A000h
mov es,ax
mov ax,0ffa6h
mov gs,ax
mov si,0eh
xor di,di
mov dx,di
mov ch,16
.printline:
mov cl,16
mov di,dx
shl di,2
add di,dx
shl di,6
.printchar:
inc di
mov bl,8
.nextline:
mov al,[gs:si]
add si,1
mov ah,80h
.nextpix:
mov bh,0 ;black
test al,ah
je @f
mov bh,1 ;blue
@@:
mov [es:di],bh
inc di
shr ah,1
jne .nextpix
add di,320-8
dec bl
jne .nextline
sub di,320*8-8
dec cl
jne .printchar
add dl,9
dec ch
jne .printline
@@:
in al,60h
cmp al,1
jne @b
ret
UFO NOSS  |
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12 Dec 2007, 03:28 |
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Picnic 13 Dec 2007, 19:08
Thank you both for your help, i've tested both ways.
I can't locate the bytes at FFA6:000E in xp console but it's ok on DosBox Emulator. Vga's 1130h works fine. |
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13 Dec 2007, 19:08 |
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Picnic 24 Dec 2007, 22:30
Displays a nice big 'FASM' in mode 13h, tested on Windows xp.
Code:
org 100h
mov al,13h ; mode 13h 320x200
int 10h
mov si,fasm ; offset address
mov bx,4 ; x horizontal coordinate
mov cl,bl ; outer loop (4 characters)
find:
lodsb
cbw ; byte to word
shl ax,3 ; ax*8
lgs di,[fs:43h*4] ; font table location
add di,ax ; find current letter
mov dx,60 ; y vertical coordinate
mov ch,8 ; inner loop (8 bytes)
get:
mov ah,[gs:di] ; get character byte
call draw
add dx,10
inc di ; next byte
dec ch
jnz get
add bx,80
loop find ; find next character
xor ah,ah ; wait for key
int 16h
mov ax,3 ; restore text mode
int 10h
int 20h ; exit program
draw:
pusha ; save registers
mov al,8 ; for each bit in byte
bit:
shl ah,1 ; shift to the left
jnc nxt ; draw tile if carry flag
mov cl,8 ; tile height (pixels)
tout:
mov ch,8 ; tile width
tin:
call pixel
inc bx
dec ch
jnz tin
sub bx,8
inc dx
loop tout
sub dx,8
nxt:
add bx,10
dec al
jnz bit
popa ; restore registers
ret
pixel:
pusha
mov cx,bx
mov ax,0c0fh ; draw white pixel at cx,dx
int 10h
popa
ret
fasm db 'FASM'
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24 Dec 2007, 22:30 |
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DOS386 25 Dec 2007, 00:14
thimis wrote: Displays a nice big 'FASM' in mode 13h, tested on Windows xp. Did you test on DOS also ? You know, it displays junk 
Code:
org 100h
mov al,13h ; AH = ??? _________________ Bug Nr.: 12345 Title: Hello World program compiles to 100 KB !!! Status: Closed: NOT a Bug |
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25 Dec 2007, 00:14 |
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Picnic 25 Dec 2007, 10:18
Unfortunately no, only on Windows xp Dos and Dosbox Emulator.
Thanks for the indications NTOSKRNL_VXE, zero on both cases |
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25 Dec 2007, 10:18 |
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shoorick 25 Dec 2007, 11:10
here is an old font editor. unfortunatelly (for you) it has russian interface, but it is so simple, so you can try to use it in a "blind" way:
1.when you start it it will ask you to search font: in file (up option) and in memory (down option). if you will choose file - you will need then to type file name manually (if file not found - check if it is not hidden or so). if it is not in current dir - maybe need to type full file name. 2.after file or memory searched - suggested list of found fonts 8x?? - you may chose one to edit or search manually. 3.if you are searching manually "+"/"-" increase/decrease font height to update search. 4.when you found a font you may edit it: press F4 5.while editing - walking by dots - arrow keys, by symbols - shift+arrow keys, toggle dot - space bar. options: F2-save full this file F3-replace current font with another from other file F4-save current font to file
_________________ UNICODE forever! |
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25 Dec 2007, 11:10 |
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