How to program in assembler8086 the unix command "banner"

monkam

Dear Mr. or Mrs..

I am studying in Germany. Since one week now, Im
trying without any result to write the program bellow in assembler.
I will be very greatfull if you could help me.
This is the program:
Write a program that constructs the UNIX-command
"banner".
Banner is a command which enlarge each letter to a 8*8
letter matrix.

Example: c:...> banner hallo
hallo(appears in big characters on your DOS screen)

have a nice day.

blitz

: Dear Mr. or Mrs..
:
: I am studying in Germany. Since one week now, Im
: trying without any result to write the program bellow in assembler.
: I will be very greatfull if you could help me.
: This is the program:
: Write a program that constructs the UNIX-command
: "banner".
: Banner is a command which enlarge each letter to a 8*8
: letter matrix.
:
: Example: c:...> banner hallo
: hallo(appears in big characters on your DOS screen)
:
: have a nice day.
:
:

Here's a program written by me some years ago that displays (actually scrolls) some big characters using the 80x50 text mode and the 8x16 ROM font - there are a little bit too many hard-coded values (and no comments :-)) in it but maybe it'll prove of some use to you...

[code]
void vga25() {
asm {
mov ax,3
int 0x10
}}

void cursor_off() {
asm {
mov ah,1
mov ch,127
int 0x10
}}

void vga50() {
asm {
mov ax,0x1202
mov bl,0x30
int 0x10
mov ax,3
int 0x10
mov ax,0x1112
xor bl,bl
int 0x10
}}

long getfontaddr() {
asm {
mov ax,0x1130
mov bh,6
push bp
push es
int 0x10
mov dx,es
mov ax,bp
pop es
pop bp
}}

void scroll2left() {
asm {
push ds
push es
cld
mov ax,0xb800
mov ds,ax
mov es,ax
mov si,2+1440
mov dx,2
mov di,1440
mov bx,32
}
repeat:
asm {
mov cx,79
rep movsw
add si,dx
add di,dx
dec bx
jnz repeat
pop es
pop ds
}}

long addr = getfontaddr();

void drawcol(int car, int col) {
asm {
push ds
push es
lds si,addr
mov ax,car
shl ax,4
add si,ax
mov ax,0xb800
mov es,ax
mov di,79*2+1440
mov ax,32+256*7
mov bx,1+256*(10+16*4)
mov dh,128
mov cx,col
shr dh,cl
mov cx,16
}
repeat:
asm {
mov dl,[si]
and dl,dh
jz no_way
mov es:[di],bx
mov es:[di+160],bx
jmp end_loop
}
no_way:
asm {
mov es:[di],ax
mov es:[di+160],ax
}
end_loop:
asm {
inc si
add di,160*2
loop repeat
pop es
pop ds
}}

void waitretrace() {
asm mov dx,0x3DA
d1:
asm {
in al,dx
and al,8
jnz d1
}
d2:
asm {
in al,dx
and al,8
jz d2
}}

int keypressed() {
asm {
mov ah,0x11
int 0x16
mov ax,0
jz exit
inc ax
}
exit:
}

char msg[] = "POSHSOFT WARNING: Learning Assembler Now Greatly
Reduces Serious Problems Of Your Programs. ";

void main()
{
int i = 0, j = 0, k, l;

vga50(); cursor_off();
while (1) {
l = (i<18) ? 2:1;
for (k = 0; k < l; k++) {
waitretrace(); scroll2left();
drawcol(msg[i], j);
}
j++;
if (j > 7) {
j = 0; i++;
if (!msg[i]) i = 0;
}
if (keypressed()) break;
}
vga25();
}
[/code]