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Run DEBUG.  DEBUG will present a dash prompt.  Type in the bits below shown in brown:

-  a100
xxxx:0100  mov dx,3f2
xxxx:0103  mov al,14
xxxx:0105  out dx,al
xxxx:0106  jmp 105
xxxx:0108             <----- at this line just press the [ENTER] key - this will return DEBUG's dash prompt
- g=100

Note: 'xxxx' is a substitute for the segment that I see.  It is unimportant.

Note:  The 'jmp 105' issues the command to the controller continuously.