🚀 go-pugleaf

  Thanks to all of you who offered suggestions on my problem.  Unfortunately,
I have still not been able to make any progress.  I am posting again to give
more details in hopes that someone may still be able to help.

  My isr is in a dll.  I have the segment decalred as FIXED in the def file.
 It was suggested that I still need to use GlobalPageLock.  I am attempting
 this with the following lines of code:


HGLOBAL hCS;



 _asm mov hCS, cs

 GlobalPageLock(hCS);

 Is this the correct way to do this?

    I have been told that the only thing I may call during an interrupt is
 PostMessage.  Am I allowed to call OutputDebugString???  This isn't the
 problem anyway.  If I take them out, it still crashes.

    I am not worried about making this as bullet proof as some have suggested.
 Once the interrupt is enabled, the next press of the mouse button will cause
 the program to disable it, so I don't have to worry about switching to a dos
 prompt or anything like that.

    I am using INT 21h to set the interrupt vector.  Is there some other way
 I should do this?

    Now for an explination of what is happening.  The isr is supposed to fill
 data buffers with info each time an interrupt occurs, then it sets a bit in
 a header to indicate that the buffer is done.  The program using the driver
 keeps checking the bit to see when the data is ready, then it saves it to a
 file or something, I don't have the code for the calling program.  The isr
 works with no problem if it never sets the bit to indicate the data is ready.
 Of course, the calling program never knows there is any data either.  When I
 add the line that sets the bit, the isr gets called, fills the buffer, marks
 it as being done, and exits.  Then the computer crashes.  I have seen the
 message "No rom basic, system halted" quite a bit recently.  Why would it give
 me this message?  It will crash in other ways depending on what other programs
 are in memory at the time (such as Dr.Watson, and WinDebug) sometimes the
 whole system freezes, the mouse cursor included.

   Please, help me.  I have been stuck on this for weeks.  I am getting really
 frustrated.  Any comments are appreciated.  If anything is unclear from my
 description, or if you need more info, please let me know.

    Thank You,
        Keith (kdw103@psuvm.psu.edu)