🚀 go-pugleaf

This message is about a problem we're having with a custom-made
keyboard controller under OS/2.

We're using a special kind of input device (a control wheel, or
knob).  It's connected to a keyboard controller based on a Motorola
USAR SC405367FN chip.  This custom made controller translates moves
and presses of the wheel into key codes that are presumably
compatible with the usual PC AT compatible keyboard.  Turns of the
wheel are translated into arrow keys.

The problem is this: in PM applications, the arrow key messages don't
function properly.  I wrote a test program to see what my
ClientWndProc was receiving.  I wrote to a file all the info coming in
with the WM_CHAR message.  Both the custom and the standard controller
were tested.  When comparing them, the *only* difference was that:

1) the KC_VIRTUALKEY flag was not set with the custom controller
2) (Perhaps as a result of the above,) the virtual key code was zero.  

The scan codes were correct with both controllers.

The problem occurs *only* in PM apps, not in full screen apps.  Also,
when tested with a standard keyboard and controller, this problem did
not occur.

I looked up the BIOS function calls for the keyboard, and there is no
such information as a virtual key flag.  (I know that OS/2 doesn't use
the BIOS, but I wanted to see what information it provided.)

How does OS/2 know its value?  Does it infer from the scan code
whether or not it's a virtual key?

Can anyone tell me what's happening here?  Does PM infer from the
scan code whether or not it's a virtual key?  Or is it the reverse,
does it decide to find the virtual key code because the virtual key
flag is set?

Is there any information coming from the keyboard controller other than
the scan code and shift states?

Thanks for any help.  If you have information that may help, please
feel free to call collect (from continental US or Canada), at (703)
941-5952.

- Keith
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Keith Bennett                            Bennett Business Solutions, Inc.
C++/C Software Development               1605 Ingram Terrace
kbennett@access.digex.net                Silver Spring, MD USA 20906-5932