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_ITOBS.D
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1988-07-11
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; Doug's Programming Language -- DPL, Version 2.22
; Copyright (c) 1988 Douglas S. Cody, All rights reserved.
;--------------------------------
; _ITOBS - CONVERT INTEGER TO BINARY STRING
;
; Entry Conditions:
; AX HOLDS THE VALUE
; CX HOLDS THE LENGTH OF THE TARGET STRING
; DI POINTS TO THE STRING
;
; Exit Conditions:
; DI,AX,BX,CX,DX MODIFIED
;
SUBPGM _ITOBS
BEGIN _ITOBS
ADD DI,CX ; CALC THE START OF THE STRING
MOV BYTE PTR [DI],00 ; SET THE TERMINATOR
JCXZ @ITB35 ; EXIT IF NO COUNT
DEC DI ; STEP BACK TO THE 1ST VALID LOCATION
MOV DX,01 ; LOAD THE MASK
MOV BX,'10' ; GET THE CHARACTER PAIR TO BE STORED
;
@ITB20:
TEST DX,AX ; IS THIS BIT SET?
JNE @ITB25
MOV [DI],BL ; NO, SAVE A '0'
JMP SHORT @ITB30
;
@ITB25:
MOV [DI],BH ; YES, SAVE A 1
;
@ITB30:
DEC DI ; STEP BACK TO THE NEXT LOCATION
SHL DX,1 ; MOVE THE MASK BIT ONE POSITION
LOOP @ITB20 ; CONTINUE UNTIL DONE
;
@ITB35:
RET ; EXIT NOW
ENDPGM _ITOBS
;