# Category : Assembly Language Source Code

Archive : ASM_SUBR.ZIP

Filename : OCT16IN

; from BLUEBOOK OF ASSEMBLY ROUTINES FOR IBM PC & XT.

; page : 45

;

; NAME OCT16IN

; ROUTINE FOR conversion from ASCII octal to 16-bit Binary

;

; FUNCTION: This routine accepts an octal number from the standard input

; device and converts it to internal 16-bit binary form.

; INPUT: The individual digits of the octal number are received in ASCII

; through a call to a standard I/O routine. The valid digits are 0 - 7.

; An ASCII code other than for a valid digit will terminate the routine.

;

; OUTPUT: A 16-bit binary number is returned in the DX register.

; REGISTERS USED: Only DX is modified. It returns the result.

; SEGMENTS REFERENCED: None

; ROUTINES CALLED: STDIN

; SPECIAL NOTES: None

;

; ROUTINE TO CONVERT FROM ASCII OCTAL TO INTERNAL 16-BIT BINARY

;

oct16in proc far

;

push cx ; save registers

push ax

;

mov dx,0 ; initialize DX

;

oct16in1:

call stdin ; a digit comes in in AL

sub al,30h ; reduce from ASCII

jl oct16in2 ; check if too low

cmp al,7

jg oct16in2 ; check if too high

cbw ; convert to word

;

mov cl,3

sal dx,cl ; shift dx left once

add dx,ax ; add in digit

jmp oct16in1

;

oct16in2:

;

pop ax ; restore registers

pop cx

ret ; return

;

oct16in endp

;-------------------------oct16in routine ends---------------------------+

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