Interfacing two computers Through Parallel Port

[IJKHAN]

Hi Everyone,

I was trying to interface two computers through the
parallel port. But when i send data from one computer
say A to another computer B. Then I dont receive the
data at computer B. I am using port 378 for
tranferring and receiving.

Computer A Program
.model small
.stack 100h
.data
.code
.startup
mov dx,0378h
mov al,'a'
out dx,al
.exit
end
Computer B Program
.model small
.stack 100h
.data
.code
.startup
mov dx,0378h
in al,dx
mov ah,2
mov dl,al
int 21h
.exit
end
Computer A sends the data and Computer B recieves the
data
Thanxs
Faisal

 

[bluetongol]

hello.

i am not really good at assembly language or any other programming languages, but i think what you are trying to do is not possible...correct me if i am wrong, you are trying to display "a" to machine b..

it will not work because the data you've sent will be lost before machine a will be able to get it..unless you've timed it perfectly. think about how fast the data will go from machine a to machine b....

anyway, what you can do is add a combinational circuit between the two machines...or maybe you can make a TSR program that will run on the background of your machine b that will wait for the data from machine a.

i hope this will help

 

[bluetongol]

another posibility is to loop your program in machine a, long enough for machine b to be able to collect the data..

this is just another thought..

 

[zeitghost]

Consider using a hardware handshake so that the transmitting end raises a line to indicate data present and the receiving end raises a line to indicate data read.

rgds
Zeit.