From: nowhere@never.at   
      
   On 10/11/2023 17:50, Robert Pengelly wrote:   
   > Does anyone know how I get IRQ4 INT 0Ch working for a 16-bit OS?  On   
   https://wiki.osdev.org/Interrupts it has "8-15 	Default mapping of IRQ0-7 by   
   the BIOS at bootstrap", Is that only for 32-bit or is it for both 32 and 16   
   bit?  Do I need to manipulate    
   things to get IRQ4 INT 0Ch working for 16-bit?   
      
   old 16 bit hardware had jumpers on COM/LPT add-on boards for setup IRQ-   
   number and CS aka I/O address.   
   modern stuff have this all emulated in the south-bridge (in the chip-set   
   on main board) and may or may not allow modification of their defaults.   
      
   how much do you already know about IRQ-redirection ?   
      
   it depends on your hardware if you need to modify anything.   
      
   and what are you trying to achieve with IRQ4 ?   
   is there any COM-port connected to it at all ? my PC don't have any.   
   __   
   wolfgang   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)