Speculated Input.KeyDown Problem

[Dragon20942]

What is it you are trying to achieve?
I have created a program that successfully outputs the ordinal values of different characters. However, there is an interesting thing that I noticed that I would like explained.


What is the problem you are having?
. There seems to be a maximum number of keys that are registered as pressed a one given time. This number also seems to vary based on which keys are pressed. For example, if I press 'a','s','d','f', and '3' in combination, only 'a','d', and '3' might appear on the screen. If I let go of 'd', I might be able to put both 's' and 'd' in as well. However, these combinations seem to be constant. The page on Input.KeyDown explains that detection is minimum two keys in conjunction with shift, ctrl, and alt, but if it were possible, I would like to devise specific combinations of keys which have the highest simultaneous registering.

Describe what you have tried to solve this problem
I tried adding the values, and looking up Input.KeyDown.
I also tried to do some experimentation:

Example:
a s d f j k l ; p will all register simultaneously

a s v b works, but a s b v will not let v register

Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)
<Answer Here>

Turing:

View.Set ("offscreenonly") var chars : array char of boolean var pressed : array 0 .. 255 of boolean for i : 0 .. 255     pressed (i) := false end for loop     Input.KeyDown (chars)     for i : 0 .. 255         if chars (chr (i)) then                 put chr (i), " -> ", i         else             pressed (i) := false         end if     end for     View.Update     delay (5)     cls end loop

Please specify what version of Turing you are using
4.1.1

[Dreadnought]

The problem actually has to do with the physical keyboard (try using different keyboards and see if you get different results).

I believe this is called key rollover. Basically the ability of a keyboard to properly detect multiple keys being pressed at once.

EDIT: can't get url to work (maybe I'm forgetting how to do this...) look it up for more info.

[Raknarg]

Neat little turing trick:

Turing:

View.Set ("offscreenonly") var chars : array char of boolean loop     Input.KeyDown (chars)     for ch : char         if chars (ch) then                 put ord(ch), " -> ", ch         end if     end for     View.Update     delay (5)     cls end loop

The keyword "char" isn't magic, it actually means a range containing all char values. So when you say array char of boolean, you're actually creating an array where the range is all the characters, and each index is a different character. I've discovered Turing actually has some cool set and range properties

[Dragon20942]

Yeah, key rollover seems like the problem, thanks! It looks like to actually have a foolproof method of determining which combinations of keys work, you have to download detector software