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TrurlTeam

@teamtrurl.bsky.social

16 followers 32 following 8 posts

TRURL is a suite of #RPN (reverse Polish notation) calculators written in Object Pascal, and it includes a free and open RPN engine for your own #Pascal programs. http://trurl.sf.net

trurl.sf.net

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TrurlTeam @teamtrurl.bsky.social · 12h

A new #TRURL app has been released. TRURL B follows the design of the famous calculators created by Dietrich Lubs and Dieter Rams for the German company Braun.

It implements all fundamental operations plus power, square, square root, and the inverse operation.

sourceforge.net/projects/tru...

Screenshot of TRURL B on macOS Ventura 13.7.8

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TrurlTeam @teamtrurl.bsky.social · 18h

The RPN engine of the #TRURL project has been released in version 1.2 (Gimel). This new version introduces a square function for your calculator apps.

#RPN #Reverse_Polish_Notation #Pascal programming.

trurl.sourceforge.io
doi.org/10.5281/zeno...
doi.org/10.5281/zeno...

Screenshot of the Lazarus IDE with TRURL's RPN engine and a test app using this library and FPCUnit.

TrurlTeam @teamtrurl.bsky.social · 18h

TRURL's #Segmitator 1.2 has been released. The new version includes support for high-res displays, setting the size of the decimal separator, and output of limited length.

#TRURL

trurl.sourceforge.io

Screenshot for a test app of Segmitator 1.2. It shows how the input number 4.2E-6 is displayed (as 42E-7) in both text mode and as a graphic representation.

Reposted by TrurlTeam

Scientific Pascal @scipastips.bsky.social · 2d

Apple's legendary #Pascal syntax poster from 1979. It was created by Jef Raskin to adapt the syntax of Bill Atkinson’s #Apple_Pascal compiler. The poster was over the desk of every programmer at #Apple and over the desks of many programmers outside of Apple.

vintagecomputer.ca/the-history-...

The Apple Pascal Poster. This poster depicts graphically the Syntax of the Pascal programming language. Coloured line graphic on a black background.

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Reposted by TrurlTeam

Scientific Pascal @scipastips.bsky.social · Aug 30

Announcing the 2025 Pascal Conference
in Sundern, Germany, 18-21 September

pascalconference.com

Banner image of the 2025 Pascal Conference with portraits of the invited keynote speakers.

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Reposted by TrurlTeam

Scientific Pascal @scipastips.bsky.social · May 8

The Lazarus IDE for Free Pascal has been launched in version 4.0. This major new release introduces multiple novel features, including new event types, extended support for Cocoa, optional docking, more debugger options and extended components.

#Lazarus_IDE #FreePascal

www.lazarus-ide.org

Screenshot of Lazarus 4.0 on macOS 13.7.5 Ventura.

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TrurlTeam @teamtrurl.bsky.social · Apr 19

Version 1.1.0 of TRURL's segmitator has been released. It features support for exponential notation, error messages and improved handling of small numbers.

trurl.sourceforge.io
github.com/jwdietrich21...
codeberg.org/jwdietrich/t...

Screenshot of the source code of TRURL's segmitator 1.1.0 with a demo app

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TrurlTeam @teamtrurl.bsky.social · Apr 19

Version 1.1.0 of TRURL's RPN engine is available. This version introduces optional HP-like behaviour to the roll-down function of the stack.

trurl.sourceforge.io
github.com/jwdietrich21...
codeberg.org/jwdietrich/t...
doi.org/10.5281/zeno...

Screenshot of the source code of TRURL's RPN Engine 1.1.0

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TrurlTeam @teamtrurl.bsky.social · Apr 16

#TRURL G has been updated to version 1.2.1. This is a recommended bug-fix release that addresses an issue with the erroneous display of small numbers and makes the roll-down feature more HP-like.

TRURL is available from trurl.sf.net.

Screenshot of TRURL G 1.2.1 on macOS 13.7

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Reposted by TrurlTeam

Scientific Pascal @scipastips.bsky.social · Apr 6

MacPaint was a revolutionary app that demonstrated the capabilities of early #Macintosh computers. Jeffrey Starr reviews its source code in his blog. The code in #Pascal and assembly language, while still in old procedural style, is an example of good programming practice.

ztoz.blog/posts/macpai...

MacPaint screenshot with Japanese Lady (1984)

Source code of the HVContrain procedure:

PROCEDURE HVConstrain(VAR newPt: Point);
VAR dh,dv: INTEGER;
BEGIN
IF shiftFlag THEN { constrain to horiz or vert }
BEGIN
IF hConstrain AND vConstrain THEN { still chosing direction }
BEGIN
dh := ABS(newPt.h-ptConstrain.h);
dv := ABS(newPt.v-ptConstrain.v);
IF (dh > dv) AND (dh > 1) THEN vConstrain := FALSE;
IF (dv > dh) AND (dv > 1) THEN hConstrain := FALSE;
END;
IF hConstrain THEN newPt.v := ptConstrain.v; { horiz }
IF vConstrain THEN newPt.h := ptConstrain.h; { vert }
END;
END;

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TrurlTeam @teamtrurl.bsky.social · Feb 23

#TRURL G 1.2.0 (Columbia) has been released. This new version introduces extended error-handling capabilities.

trurl.sf.net

Screenshot of TRURL G 1.2 on macOS 13.7.4 Ventura

Screenshot of TRURL G 1.2 on macOS 13.7.4 Ventura, showing an error message.

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TrurlTeam @teamtrurl.bsky.social · Feb 23

#TRURL’s #Segmitator library has been updated to version 1.0.1, implementing a bug fix.

trurl.sf.net

Screenshot of a test app for segmitator. It shows two virtual seven-segment displays implemented with different techniques (ASCII and graphics)

Screenshot of parts of Segmitator`s sourcecode in Object Pascal.

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