- 4.24.2.23. -
Table of Contents
4. Standard Units
4.24. DOS - MSDOS support unit
4.24.2. DOS Unit Procedures and Functions
4.24.2.23. Intr
4.24.2.23. Intr
Targets: MS-DOS only
Dos Unit, WinDos Unit
Executes a specified software interrupt.
Declaration:
procedure Intr(IntNo: Byte; var Regs: TRegisters);
Remarks:
Before calling Intr, load Regs with the appropriate parameters
needed for the interrupt. Regs returns the values of the registers
after the interrupt call. Calls that depend on ESP and SS cannot be executed.
For more information about software interrupt calls consult your BIOS and DOS
reference manual.
Note that all segment resgisters (DS,ES,FS,GS) must contain valid segment
descriptors or be set to zero prior to calling Intr.
All interrupt calls that require an offset must be passed a 32 bit offset.
Example:
uses
Dos;
function GetVideoMode: Byte;
var
Regs: Registers;
begin
Regs.AX := $0F00;
Regs.DS := DSeg; Regs.ES := 0;
Regs.FS := 0; Regs.GS := 0;
Intr($10, Regs);
GetVideoMode := Regs.Al;
end.
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