From: robertapengelly@gmail.com   
      
   On Thursday, 16 November 2023 at 06:35:59 UTC, wolfgang kern wrote:   
   > On 15/11/2023 09:27, Robert Pengelly wrote:   
   > ...   
   > > Right, I rewrite all the IRQ12 related stuff and it seems to work as I get   
   an A printed in the handler when I capture the mouse with qemu, how do I tell   
   the controller that I've got the data? I've tried:   
   > >   
   > > in al, 0x20   
   > > out 0x20, al   
   > >   
   > > in al, 0x60   
   > > out 0x60, al   
   > >   
   > > and   
   > >   
   > > in al 0x64   
   > > out 0x64, al   
   > >   
   > > and nothing happens as I only get the A printed once   
   > END of INTERRUPT(IRQ12):   
   > MOV AL, 0xA0   
   > OUT 0xA0,AL ;release IRQ 12   
   > OUT 0x20,AL ;and the cascaded IRQ0..7   
   >   
   > END OF INTERRUPT(IRQ4):   
   > MOV AL,0x20   
   > OUT 0x20,AL   
   >   
   > but if the mouse is out of sync it may need a reset   
   > __   
   > wolfgang   
   Right, I have:   
      
   ps2_handler:   
      
       push    ax   
       in      al,     HEX (60)   
      
       mov     al,     'A'   
       call    writechr   
      
       mov     al,     HEX (A0)   
       out     HEX (A0),   al   
      
       mov     al,     HEX (20)   
       out     HEX (20),   al   
      
       pop     ax   
       iret   
      
   and I get three A's printed every time I move the mouse so that's a good   
   sign.  Looking at the PS/2 packets on https://roborooter.com/post/serial-mice/   
   it has:   
      
                D7      D6      D5      D4      D3      D2      D1      D0   
   Byte 1  XV      XV      YS      XS       1       M       R       L   
   Byte 2  X7      X6      X5      X4      X3      X2      X1      X0   
   Byte 3  Y7      Y6      Y5      Y4      Y3      Y2      Y1      Y0   
      
   L       Left button state (1 = pressed down)   
   M       Middle button state (1 = pressed down)   
   R       Right button state (1 = pressed down)   
   X0-X7   Movement in X direction   
   Y0-Y7   Movement in Y direction   
   XS,YS   Movement data sign bits (1 = negative)   
   XV,YV   Movement data overflow bits (1 = overflow has occurred)   
      
   Is the D3 the status bit?  Also, what is the XV/YV for?  It says overflow bit   
   but I'm a little confused as to what I do with it.   
      
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