It has to do with the in hardware device key mapping.
Most keyboards use resistance circuits to tell which key has been depressed. When you depress more than 1 key most of these designs cannot tell between the values.
Modifier Keys like shift, control are mostly separately monitored and thus independent.
Most keyboards use resistance circuits to tell which key has been depressed. When you depress more than 1 key most of these designs cannot tell between the values.
Modifier Keys like shift, control are mostly separately monitored and thus independent.
See the matrix on this page:: http://www.instructables.com/id/Make-your-own-Roll-Up-Keyboa...