Is there someone who could help me convert this
to Tasm style.
Thanks.
; celsius.asm Nasm code
; Need this converted to Tasm style
; so I can help him
BITS 16 ;16 bit instructions used
ORG 100h ;start of .com program
SECTION .text ;text section follows
main:
mov si,prompt1
call PrintString
mov di,Instring
call ReadString
call CRLF ;INPUT Instring$
mov si,Instring
call StrToNum ;ax = VAL(InString$)
; ------- ax = (int)((ax - 32) * 5 / 9) -----------
sub ax,32 ;ax = ax - 32
mov bx,5
imul bx ;ax = ax * 5
mov bx,9
idiv bx ;ax = ax / 9 (dx = remainder, ax = quotient)
xchg ax,dx ;now ax = remainder and dx = quotient
; round up the value
mov bl,5
idiv bl ;al = al / bl
cbw ;convert byte to word
add ax,dx ;ax = ax + quotient
mov si,Instring
call NumToStr ;InString$ = STRING$(ax)
mov si,Instring
call PrintString
call CRLF ;PRINT InString$
;--------------------------------------------------
mov ax,4C00h
int 21h
;** READ KEYBOARD TO STRING POINTED TO BY DI **
;** ReadString(SI) **
ReadString:
push dx
push ax
push di
push bx
mov bx,di
NextChar:
sub ah,ah
int 16h ;wait for key function
cmp al,13 ;[ENTER] key?
jz Done
cmp al,8 ;[<-] key?
jz BackSpace
mov [di],al ;save character
inc di
mov dl,al ;
mov ah,2
int 21h ;echo character
jmp NextChar
BackSpace:
cmp di,bx ;at beginning?
jz NextChar ;yep no back space
dec di
mov ah,2
mov dl,8
int 21h ;backspace
mov ah,2
mov dl,' ';
int 21h ;PRINT " ";
mov ah,2
mov dl,8
int 21h ;backspace
jmp NextChar
Done:
sub al,al ;clear al
mov [di],al ;null string
pop bx
pop di
pop ax
pop dx
ret
;** PRINT STRING POINTED TO BY SI **
PrintString:
push dx
push ax
push si
PrintLoop:
mov al,[si]
inc si
or al,al ;test for al=0
jz Finish
mov dl,al
mov ah,2
int 21h ;print character
jmp PrintLoop
Finish:
pop si
pop ax
pop dx
ret
CRLF:
push ax
push dx
mov ah,2
mov dl,13
int 21h
mov dl,10 ;lf
int 21h
pop dx
pop ax
ret
;** Convert string pointed to by SI to number in ax **
StrToNum:
push bx
push cx
push dx
push si
mov BYTE [sign],0 ;assume positive number
sub cx,cx ;cx = 0
mov bx,10 ;base 10
mov al,[si]
cmp al,'-'
jne NextDigit ;positive number
inc si ;skip '-' character
mov BYTE [sign],1 ;negative number
NextDigit:
mov al,[si] ;get digit
inc si
sub ah,ah ;ah = 0
sub al,'0' ;convert to 0-9 value
jc NotDecDigit
cmp al,10 ;
ja NotDecDigit
xchg ax,cx ;ax = old value cx = new value
mul bx ;ax = ax * 10
add cx,ax ;add new result
jno NextDigit
call OverFlow
NotDecDigit:
mov ax,cx ;ax = result
cmp dl,BYTE [sign]
jz positive
neg ax ;was negative signed
positive:
pop si
pop dx
pop cx
pop bx
ret
OverFlow:
push ax
push bx
push cx
push dx
push si
call CRLF
mov si,error2
call PrintString
call CRLF
pop si
pop dx
pop cx
pop bx
pop ax
ret
;** Convert number in ax to string pointed to by DI **
NumToStr:
push ax
push dx
push cx
push bx
push di
mov bx,10
xor cx,cx
cmp ax,0
jge NotZero ;ax positive number
neg ax ;2's complement
mov BYTE [di],'-'
inc di
NotZero:
xor dx,dx ;set upper word of N to 0
div bx ;N/10 and n mod 10
add dl,'0' ;remainder in dl convert to asc
push dx ;push one digit onto stack
inc cx ;count digits
or ax,ax ;n = 0?
jne NotZero
PopDigit:
pop ax ;last digit first
mov [di],al ;
inc di
loop PopDigit
sub al,al ;al = 0
mov [di],al ;null string
pop di
pop bx
pop cx
pop dx
pop ax
ret
WaitKey:
mov ah,7
int 21h
ret
section .data
prompt1 db ' Enter number: ',0
error1 db 'overflow',0
error2 db 'input OVERFLOW',0
sign db 0 ;sign of number
section .bss
Instring resb 256WebN
