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Encoding:
Assembly Source File  |  1987-09-13  |  346 b   |  10 lines
  1. cseg   segment para public 'code'
  2.        assume  cs:cseg,ss:cseg,ds:cseg
  3.        org     100h
  4. start: in      al,61h          ;read port 61H
  5.        xor     al,04h          ;toggle bit 2 (allows speed change)
  6.        out     61h,al          ;send new value back
  7.        ret                     ;return to DOS
  8. cseg   ends
  9.        end     start
  10.