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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_300
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314_01
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portio.asm
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Assembly Source File
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1990-05-14
|
2KB
|
93 lines
title portio.asm
page 65,132
;==============================================================================
;
; The Microcom MNP Library
; (Microsoft C Version)
;
;---------------------------------------------------------------------------
;
; PORTIO - MNP port input/output routines
;
;------------------------------------------------------------------------------
;
; Modification History:
;
; 4/1/87 - Compuserve V1.0
;
;---------------------------------------------------------------------------
;
; inp - input byte from port
;
; synopsis: c = inp(port);
;
; input:
; int port; port address
;
; output:
; int c: returned data byte
;
;------------------------------------------------------------------------------
;
; outp - output byte to port
;
; synopsis: outp(port,c);
;
; int port; port address
; int c; byte to send
;
;==============================================================================
;
_data segment word public 'DATA'
_data ends
dgroup group _data
_text segment byte public 'CODE'
assume cs:_text,ds:dgroup
public _inp
public _outp
;PUBLIC************************************************************************
;
; _inp - read port
;
;******************************************************************************
_inp proc near
push bp
mov bp,sp
mov dx,[bp+4]
in al,dx
xor ah,ah
POP BP
RET
_inp endp
page
;PUBLIC************************************************************************
;
; _outp - write port
;
;******************************************************************************
_outp proc near
push bp
mov bp,sp
mov dx,[bp+4]
mov ax,[bp+6]
out dx,al
pop bp
ret
_outp endp
_text ends
end