Difference between revisions of "TI Logo II"

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(Just the start of an article. Needs lots more work.)
(add sample TI Logo procedure)
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LOGO 2 contains a new tiny bug...the primitive MS (makeshape) which works in a defined procedure in LOGO 1 can only be used in direct mode in LOGO 2. Thus one of the sample procedures supplied will not run.
LOGO 2 contains a new tiny bug...the primitive MS (makeshape) which works in a defined procedure in LOGO 1 can only be used in direct mode in LOGO 2. Thus one of the sample procedures supplied will not run.
Sample of a TI Logo routine:
TO TREE :SIZE :ANGLE :LEVEL
IF :LEVEL = 0 THEN STOP
LEFT :ANGLE
FORWARD :SIZE * 2
TREE :SIZE :ANGLE :LEVEL - l
BACK :SIZE & 2
RIGHT 2 & :ANGLE
FORWARD :SIZE
TREE :SIZE :ANGLE :LEVEL - 1
BACK :5IZE
LEFT :ANGLE
END
TO WILLOW
TELL TURTLE
PENUP
BACK 24
PENDOWN
TREE B 15 B
BACK 24
END
NOW key in WILLOW Not an unpleasant result.


[[Category:Module]]
[[Category:Module]]
[[Category:Programming language]]
[[Category:Programming language]]

Revision as of 12:45, 12 October 2014

This was the second attempt by TI to implement LOGO, a language they had worked on with its inventor Seymour Papert (see his book "Mindstorms").

LOGO II like LOGO I requires memory expansion.

The graphics are produced by the language constantly redefining the usual character set, with a limit on the number of characters to redefine ("Out of Ink" error) and the use of color.

LOGO 1 had a number of bugs which were addressed in LOGO II but at the last minute a few bugs were discovered to have been introduced, as usual with software debugging.

LOGO 2 contains a new tiny bug...the primitive MS (makeshape) which works in a defined procedure in LOGO 1 can only be used in direct mode in LOGO 2. Thus one of the sample procedures supplied will not run.

Sample of a TI Logo routine:

TO TREE :SIZE :ANGLE :LEVEL
IF :LEVEL = 0 THEN STOP
LEFT :ANGLE
FORWARD :SIZE * 2
TREE :SIZE :ANGLE :LEVEL - l
BACK :SIZE & 2
RIGHT 2 & :ANGLE
FORWARD :SIZE
TREE :SIZE :ANGLE :LEVEL - 1
BACK :5IZE
LEFT :ANGLE
END
TO WILLOW
TELL TURTLE
PENUP
BACK 24
PENDOWN
TREE B 15 B
BACK 24
END

NOW key in WILLOW Not an unpleasant result.