User guide

Valiant Turtle Commands

M.I.T. Logo

Movement commands in M.I.T. Logo are prefixed by a

''T''

(for Turtle) to distinguish them from the

primitives that move only the screen turtle.

TFDn

TBKn

TRTn

TLT n

TPU

TPD

Moves the Valiant Turtle forward n steps.

Moves the

Valiant Turtle back n steps.

Pivots the Valiant Turtle right n degrees.

Pivots the Valiant Turtle left n degrees.

Puts the pen

the up position.

Puts the pen down so that the Valiant Turtle will leave a trail.

When you first load the MVAL file, the commands that control the Valiant Turtle also affect the

screen turtle.

You can "turn off" either the screen turtle or the Valiant Turtle so that one will remain

stationary while the other continues to move. For example, you can write a program with the help of

the screen turtle, debug it by having the

Valiant Turtle and the screen turtle perform simultaneously,

and run the finished version with the

Valiant alone.

Use a MAKE statement to control turtle movement. To

allow a turtle to move, MAKE it "TRUE. To

turn off a turtle, MAKE

"FALSE. For example:

To control the Valiant Turtle only, type:

MAKE

"FLOOR "TRUE

MAKE

"SCREEN "FALSE

To control the screen turtle only, type:

MAKE

"FLOOR "FALSE

MAKE "SCREEN "TRUE

To control both simultaneously, type:

MAKE "FLOOR "TRUE

MAKE "SCREEN "TRUE