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Text File  |  1988-03-14  |  243 b   |  10 lines
  1.     .globl _gdos_there
  2.  
  3. _gdos_there:
  4.     move.w    #-2, d0        ; VDI function -2 seems to test if GDOS is there.
  5.     trap    #2            ; It returns -2 if it is NOT there
  6.     cmp.w    #-2, d0
  7.     sne        d0        ; set d0.b to $FF if the cmp turned out equal.
  8.     ext.w    d0
  9.     rts
  10.