old_games/DOS3F.ASM at master · akolishchak/old_games · GitHub

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.286
code      segment   para      public
          assume    cs:code,ds:code,es:code

          org       100h

start:    jmp       install

intXXh    proc

          cmp       ah,3fh
          jne       runint
          push      ax
          push      dx
          push      ds
          mov       ah,9
          mov       dx,offset mes
          push      cs
          pop       ds

          pushf
          call      cs:[_int]

          pop       ds
          pop       dx
          pop       ax


runint:
          db        0EAh
_int      label     dword
oldXXo    dw        0
oldXXs    dw        0
mes       db        13,10,"€ƒ€  !!!!!",13,10,"$"
intXXh    endp


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install   proc      near

          push      ES
          mov       AX,DS:[2Ch]
          mov       ES,AX
          mov       AH,49h
          int       21h
          pop       ES

          push      DS
          push      ES
          mov       AX,3521h                    ;****** edit here ****
          int       21h

          mov       CS:oldXXo,BX
          mov       CS:oldXXs,ES

          cli
          mov       AX,CS
          mov       DS,AX

          lea       DX,intXXh
          mov       AX,2521h                    ;***** edit here ******
          int       21h
          sti

          pop       ES
          pop       DS

          mov       DX,offset install
          int       27h

install   endp
code      ends
          end       start