# 80×86 Architecture: DOS Extender Assembler code ``` 00003F20 00003F20 ; =============== S U B R O U T I N E ======================================= 00003F20 00003F20 00003F20 public start 00003F20 start proc far 00003F20 call sub_1050 00003F25 or eax, eax 00003F27 jz loc_3F3E 00003F2D lea edx, large aDpmiServerInit ; "DPMI server initialization error -- out"... 00003F33 mov ah, 9 00003F35 int 21h ; DOS - PRINT STRING 00003F35 ; DS:DX -> string terminated by "$" 00003F37 xor eax, eax 00003F39 jmp locret_3F44 00003F3E ; --------------------------------------------------------------------------- 00003F3E 00003F3E loc_3F3E: ; CODE XREF: start+7↑j 00003F3E lea eax, large SetVectors 00003F44 00003F44 locret_3F44: ; CODE XREF: start+19↑j 00003F44 retf 00003F44 start endp 00003F44 00003F44 _text ends 00003F44 00003F44 00003F44 end start ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.hex-rays.com/9.0sp1/user-guide/disassembler/disassembly-gallery/80-86-architecture-dos-extender.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.