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Table of Contents
4. Standard Units
4.24. DOS - MSDOS support unit
4.24.2. DOS Unit Procedures and Functions
4.24.2.25. MsDos
4.24.2.25. MsDos
Targets: MS-DOS only
Dos Unit, WinDos Unit
Executes a DOS function call.
Declaration:
procedure MsDos(var Regs: TRegisters);
Remarks:
Load Regs with the proper parameters before calling MS-DOS.
Regs returns the values of the registers after the interrupt.
Notice that TRegisters type allows access to 32 bit registers.
Calls to DOS that depend on ESP and SS cannot be executed.
To an interrupt other than $21, use Intr.
For more information about DOS interrupt calls consult your DOS reference
manual.
Note that all segment registers (DS, ES, FS, GS) must contain valid segment
descriptors or be set to zero prior to using MS-DOS.
Example:
uses
Dos;
procedure DispString(DispStr: String);
var
Regs : Registers;
begin
DispStr := DispStr + #0;
Regs.AX := $0900;
Regs.EDX:= DWord(@DispStr) + 1;
Regs.DS := DSeg;
Regs.ES := 0;
Regs.FS := 0;
Regs.GS := 0;
MsDos(Regs);
end.
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