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A new Forth book targeted at kids 5 and older is being written and will be published by Early 2025 40th EuroForth 2024 - Newcastle upon Tyne euro.theforth.net/2024 www.euroforth.org/

First idea close at Edinburg Conference, now nearly working 40th EuroForth 2024 - Newcastle upon Tyne euro.theforth.net/2024 www.euroforth.org/

How much performance do VM instruction-pointer (IP) updates cost and how much benefit do we get from optimizing them away? Two decades ago it had little effect on the hardware of the day, but on recent hardware the dependence chain of IP updates can become the critical path on processors with out-of-order execution. In particular, this happens if the VM instructions are light-weight and the app...

An idea for an alternative to touchscreens for user interfaces 40th EuroForth 2024 - Newcastle upon Tyne euro.theforth.net/2024 www.euroforth.org/

We give a mathematical semantics for a reversible Forth that supports backtracking. 40th EuroForth 2024 - Newcastle upon Tyne euro.theforth.net/2024 www.euroforth.org/

Pac-man was a graphical game designed in 1979 by a team of five people and implemented in Z80 assembly language over the course of seventeen months. This presentation will be a first person evolutionary account of my own Forth implementation in ANS94 Forth for the Digital VT420 text terminal over a three month period. The C port of the resulting application will also be covered briefly. Stress ...

For some years, a Forth binding to major version 3 of the widely used graphical user interface toolkit GTK has been available. The major version 4 of GTK introduces many incompatibilities, so that a completely different approach to the binding is needed. It will be shown how the unique features of Forth can be leveraged to overcome the difficulties introduced by GTK4. 40th EuroForth 2024 - Newc...

The implementation of Forth words has to satisfy the following requirements: 1) A word must be represented by a single cell (for EXECUTE). 2) A word may represent a combination of code and data (for, e.g., DOES-). In addition, on some hardware, keeping executed native code and (written) data close together results in slowness and therefore should be avoided; moreover, failing to pair up calls w...

The lack of an ENUM word in the Forth standard has been previously noted. The paper describes a solution that is fully faithful to Forth styling. The implementation uses recognisers. Some potentially useful extensions will be discussed. 39th EuroForth 2022 - Rome euro.theforth.net/2023 www.euroforth.org/

Prospective value semantics is suitable for describing backtracking programs. We describe how it applies to Forth. The presentation includes a new concept of function application, based on the idea that a function application might represent nothing, e.g 1/0. 39th EuroForth 2022 - Rome euro.theforth.net/2023 www.euroforth.org/

This talk presents an implementation of Forth Value Flavoured Structures, collections of data elements with named fields that are associated with their appropriate access operators. This reliefs the programmer to remember the types and access operators for all the fields in structures. 39th EuroForth 2022 - Rome euro.theforth.net/2023 www.euroforth.org/

A new mechanism based on a cryptographic message digest that helps ensuring the integrity of the system stack. Its use will be illustrated in the context of a recursive algorithm aimed at solving Hexadoku puzzles. 39th EuroForth 2022 - Rome euro.theforth.net/2023 www.euroforth.org/

UI5 is well on its way, but we took a pit-stop to implement some features on a lower level. So now we have a super shiny Terminal interface. 39th EuroForth 2022 - Rome euro.theforth.net/2023 www.euroforth.org/

In last year's talk about my unhealthy obsession with writing Forths I joked that the next step would be to automate my hobby. At least I thought I was joking: this year I present 4g, the Forth Generator, which produces Forth interpreters based on a set of user-supplied parameters, and F.A.I.L, the Forth Abstract Instruction Language, a Forth-specific assembly language that abstracts away imple...

M. Anton Ertl: The Performance Effects of Virtual-Machine Instruction Pointer Updates

Nick Nelson: Accessing an Oracle database from Forth

Jörg Völker: Mit Forth durch die Chip-Krise

Christopher Lozinski: Forth Transputer

Anton Ertl: Das magische Sechseck, Constraints, und Ausführungshäufigkeiten

Jörg Völker: Lokale Values super simpel in Fancy-Forth

Gerald Wodni: 1-bit-CPU Kontaktplan (PLC14500)

Ulrich Hoffmann: Portierung des seedForth-Multitaskers auf noForth

Bernd Paysan: net2o status report - Passphrase hashing

Anton Ertl: `See-code` in Gforth 1.0

Nick Nelson: Resource embedding in Forth

Howerd Oakford: colorForth tokens

Ulrich Hoffmann: Enums in Forth

M. Anton Ertl: Are locals inevitably slow?

Bob Armstrong: CoSy NoteComuting environment demo