Difference between revisions of "TI Logo II"
Stephen Shaw (talk | contribs) (add sample TI Logo procedure) |
Stephen Shaw (talk | contribs) (multiple corrections to code (from poor OCR)) |
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| Line 15: | Line 15: | ||
LEFT :ANGLE | LEFT :ANGLE | ||
FORWARD :SIZE * 2 | FORWARD :SIZE * 2 | ||
TREE :SIZE :ANGLE :LEVEL - | TREE :SIZE :ANGLE :LEVEL - 1 | ||
BACK :SIZE | BACK :SIZE * 2 | ||
RIGHT 2 | RIGHT 2 * :ANGLE | ||
FORWARD :SIZE | FORWARD :SIZE | ||
TREE :SIZE :ANGLE :LEVEL - 1 | TREE :SIZE :ANGLE :LEVEL - 1 | ||
BACK : | BACK :SIZE | ||
LEFT :ANGLE | LEFT :ANGLE | ||
END | END | ||
| Line 28: | Line 28: | ||
BACK 24 | BACK 24 | ||
PENDOWN | PENDOWN | ||
TREE | TREE 8 15 8 | ||
BACK 24 | BACK 24 | ||
END | END | ||
Latest revision as of 08:45, 19 December 2015
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 - 1 BACK :SIZE * 2 RIGHT 2 * :ANGLE FORWARD :SIZE TREE :SIZE :ANGLE :LEVEL - 1 BACK :SIZE LEFT :ANGLE END TO WILLOW TELL TURTLE PENUP BACK 24 PENDOWN TREE 8 15 8 BACK 24 END
NOW key in WILLOW Not an unpleasant result.