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SEND.ASM
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Assembly Source File
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1983-08-04
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955b
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27 lines
TITLE SEND CHARACTER TO PARALLEL PORT
PAGE ,132 ;SET PAGE WIDTH
;*******************************************************************************
;PROGRAM DESIGNED TO OUTPUT A CHARACTER TO PARALLEL PORT FOR USE WITH
;TTL PROGRAM. THIS PROGRAM SERVES AS THE 'INCREMENTER' FOR THE
;INPUT COMBINATIONS TO THE TTL LOGIC
;****COPYRIGHT 1983 BY WILLIAM H. MURRAY & CHRIS H. PAPPAS****
;*******************************************************************************
MYCODE SEGMENT BYTE PUBLIC
ASSUME CS:MYCODE
PUBLIC SEND
SEND PROC FAR
PUSH BP ;SAVE BP REGISTER
MOV BP,SP ;ESTABLISH NEW BP VALUE
MOV DX,00H ;BASE ADDRESS OF PRINTER
MOV SI,[BP]+6 ;GET LOCATION OF VALUE
MOV AX,[SI] ;MOVE DATA INTO AX REG.
MOV AH,00H ;CLEAR AH VALUE TO PRINT
INT 17H ;PRINT CHAR. IN AL REG
POP BP ;GET OLD BP VALUE
RET 2 ;RESET STACK VALUES
SEND ENDP ;END PROCEDURE
MYCODE ENDS ;END SEGMENT
END ;END PROGRAM