RANDOM WALK PROGRAM.
PROGRAM OCCUPIES 5000-6000 AND SOME OF PAGES 0&1
TO FREEZE DISPLAY DEPRESS ALT MODE.
TO DEFREEZE PRESS AGAIN.
CERTAIN PARAMETERS MAY BE SET FROM SWITCHES THUS:-
:-SET REQUIRED VALUE ON S.R.;
DEPRESS: X    FOR FIRST STORE LOCATION USED AS X-COORDINATE
          Y     "    "     "      "       "  "  Y-   "

          N    TO SET ALL POINTS TO X&Y COORD ON S.R.

          H    TO SET 'HOP'
          D    TO SET 'DRIFT'(ACTUALLY SETS -(DRIFT))
          L    TO SET NUMBER OF POINTS DISPLAYED

NOTES:
1)WHILST POINTS ARE IN MOTION, DO NOT SET ANY COMBINATION
  OF X,Y,L, WHICH WILL DISPLAY CORE OCCUPIED BY PROGRAM,
  OR IT WILL MODIFY ITSELF IN A RANDOM FASHION AND SCREW.

        I.E. X>400
             X+L<5000
2)FOR EFFECTS TO BE REASONABLE,Y MUST BE CLOSE TO X: IDEALLY Y=X+1
3) ALSO EFFECTS ARE BEST IF DRIFT\ -(HOP*1/2)
4)CERTAIN OTHER KEYS HAVE ODD EFFECTS:BUT: - DO NOT PRESS B. THIS
FACILITY SCREWS THE BINARY LOADER.
    (IF YOU DO PRESS B YOU ONLY LOSE THE 'HALT' AT THE END OF
     THE BIN LOADER - PLEASE PUT IT BACK?)
A.F.  15/12/66