realintr

   

Declaration:

Function realintr (intnr: Word; var regs : trealregs) : boolean;

Description:

Simulates an interrupt in real mode

Parameters:

intnr:

interrupt number to issue in real mode

regs:

registers data structure

Return values: The supplied registers data structure contains the values that were returned by the real mode interrupt. True if successful, false if not.

Notes: The function transfers control to the address specified by the real mode interrupt vector of intnr. The real mode handler must return by executing an IRET.

Errors:

Check int31error variable

See also:

Example

Program flags;

uses go32;

var r : trealregs;

begin
     r.ax := $5300;
     r.bx := 0;
     realintr($15, r);
     { check if carry clear and write a suited message }
     if ((r.flags and carryflag)=0) then begin
        Writeln('APM v',(r.ah and $f), 
                '.', (r.al shr 4), (r.al and $f), 
                ' detected');
     end else
         Writeln('APM not present');
end.