Terrapin Resources

Terrapin Logo 4 has been discontinued! Our new Terrapin Logo version is much more powerful and modern; we strongly recommend that you update to our latest release of the Logo programming language.

Terrapin Logo Release Notes

We take some pride in providing frequent updates to Terrapin Logo so bug fixes and new features can reach you as quickly as possible. Some of the bug fixes are “silent releases” with the same version number. Therefore, if you experience a problem, it may be a good idea to download and install Logo once again; your problem may already have been fixed!

Version 4.1.1

Latest version: March 6, 2016.

  • Logo was unable to detect tail recursion if the last lines of a procedure were empty lines.
  • Terrapin Logo runs on OSX El Capitan. Please update to this release if you see Logo crashes.
  • On the Mac, licenses are stored in globally readable locations so users of other accounts can launch Logo. Also, Logo did not launch for other users due to permission restrictions.
  • The ‘!’ and ‘>’ characters needed a space after them under certain circumstances.
  • -PI * 155 caused an error because the infix minus was treated incorrectly.
  • :A*:B*C+:D computation stopped after :C because “+” was incorrectly recognised as a unary plus sign. This happened only if no spaces were used.
  • a new command MILLISECONDS reports the number of milliseconds elapsed since January 1, 1970.
Version 4.1.0
  • Terrapin Logo 4.1 now has a prompt! The default prompt is “> “, but you can change it in the Appearance dialog, or by setting the PROMPT property of the PREFS object to something else.
  • A bug in the GO/LABEL commands prevented tail recursion.
  • Stack traces now display line numbers.
  • Saving the workspace did not escape vertical bars correctly.
Version 4.0.5
  • Split REMAINDER and MODULO into two separate commands; REMAINDER calculates the symmetric result, while MODULO calculates the mathematical result.
  • (FILL color) fills up to a given boundary color.
  • On Macs, absolute paths leading to a mounted volume like an USB stick does not need the /Volume prefix anymore.
Version 4.0.4
  • Support for UNC path names on Windows added so you can address shares on remote servers.
  • Support for a central installation on a Windows server added (see Instructions).
  • Improved Graphics screen refreshing.
  • The expression (2+2)+2) was evaluated incorrectly because the last “+” sign was treated as a unary operator.
Version 4.0.3
  • Fixed an issue that forced multiple license installations.
Version 4.0.2
  • IS.A wrongly identified controls and bitmaps to be TURTLEs.
  • SUBST 1 1 123 hung.
  • Under certain circumstances, PPROP crashed Logo.
  • CPROP “LOAD on a bitmap did not refresh the screen properly.
  • Unary operators: -:x + 10 applied the unary - to the entire expression.
  • Removed quotes from optional input values if they were present.
Version 4.0.1
  • BUTMEMBER hung if the search string was empty.
  • Better file/line numbers for missing closing brackets.
  • In the Bitmap and Turtle centers, empty text fields have the value 0.