_outp and _inp problems

Started by jono_123 January 18, 2004 12:45 AM

0 comments, last by jono_123 21 years ago

Author

122

January 18, 2004 12:45 AM

hi there i have two computers conected together through the lpt1 port and i send data using _outp with 0x378 as the port on one computer and if i use _inp on the same computer i get the same data back again but if i call _inp on the second computer i get something random like 4 last time i tried. if it helps im using vc++6 and one computer is under win98 and the other win95

Fruny

1,658

January 18, 2004 01:14 AM

- Are you sure that the pins you are reading and those you are writing to are the same ?
- Did you take into account that some of the pins are inverted (writing ''1'' sets them low), which may compound the problem above.
- Is your parallel port set for bidirectional I/O (BIOS option?)
- Other problems ?

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan