How to access the commands
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CLRHOME = PRGM, ->, 4
FOR = PRGM, 4
END = PRGM, 5
PAUSE = PRGM, 6
LBL = PRGM, 7
GOTO = PRGM, 8
DISP = PRGM, ->, 2
INPUT = PRGM, ->, 1
IF = PRGM, 1
THEN = PRGM, 2
STOP = PRGM, ALPHA, A

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Okay, here's your code:

PRGM: TIMER80
:CLRHOME
:DISP "TIMER80 VER 1.0"
:DISP "(C) 2001 BY:"
:DISP "CHUCK S."
:DISP "MADE 03-12-2001"
:DISP "PRESS ENTER"
:PAUSE
:CLRHOME
:DISP "UP OR DOWN?"
:INPUT "(1-UP,2-DOWN)",A
:IF A=1
:THEN
:GOTO A
:END
:IF A=2
:THEN
:GOTO B
:END
:LBL A
:DISP "PRESS ENTER WHEN","READY..."
:PAUSE
:FOR(A,0,99,1)
:FOR(B,0,59,1)
:CLRHOME
:DISP "",A,B
:FOR(C,0,55):END
:END
:END
:STOP
:LBL B
:CLRHOME
:DISP "(WHOLE NUMBERS"
:DISP "PLEASE!)"
:DISP ""
:DISP "MINUTES?"
:INPUT "(UP TO 105)",A
:CLRHOME
:DISP "PRESS ENTER WHEN","READY..."
:PAUSE
:FOR(B,A-1,0,-1)
:FOR(C,59,0,-1)
:CLRHOME
:DISP "",B,C
:FOR(T,0,50,1):END
:END
:END