initial upload

src/pe/dos_program.asm

@@ -0,0 +1,17 @@
+; Copyright (c) 2024 Epic Games Tools
+; Licensed under the MIT license (https://opensource.org/license/mit/)
+; $ c:\devel\projects\bin\win32\nasm src\pe\dos_program.asm -fbin -o dos_program.bin
+
+BITS 16
+
+SEGMENT CODE
+ push cs         ; copy psp segment address to ds
+ pop  ds
+ mov  dx, msg    ; set print string
+ mov  ah, 9h     ; print to stdout
+ int  21h
+ mov  ax, 0x4c01 ; terminate with return code 1 in al
+ int  0x21
+
+msg: DB "This program cannot be run in DOS mode.$",0
+ALIGN 8, DB