parallel port communication on turbo c++

Question

3.00/5 (1 vote)

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C#

int b;
cout<<"insert  data\n";
cin>>b;
outportb (0x378,b);
break;
case 2:
int result;
result = inportb(0x378);
cout<<result<<endl;
break;

I'm not able to overwrite first value sent to port. If I take input from port, it always give me same value no matter whatever I write to port.

Posted 8-May-11 1:47am

Azwar Habib

Updated 8-May-11 12:23pm

Hans Dietrich

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-05-08T04:42:00

Solution 1

Why on Earth do you expect to read the same value you have written?

The I/O port is not a memory device; it is not obliged to write back the value you have previously written to it. What happen depends on the behavior of the device connected to the other end of your parallel cable…

—SA

Posted 8-May-11 4:42am

Sergey Alexandrovich Kryukov

Updated 8-May-11 4:43am

v2