Past Meetup

CoSy: APL in open x86 Forth - The Colorado Springs Open Source Software Meetup

This Meetup is past

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6:00 - 6:30 PM - Food, Drinks & Networking
6:30 - 6:35 PM - Announcements
6:35 - 7:15 PM - Basic Concepts
7:15 - 7:20 PM - Break
7:20 - 8:40 PM - Main Speaker
8:40 - 8:55 PM - Door Prize Drawings


CoSy : The essence of APL in open x86 Forth

Unlike most CS(OS)^2 talks about cloud resources , CoSy is an open linguistic interface with one's computing resources . CoSy is an Open Source Project with lots of work that has been done and a lot to be done . Functionally, it is a very simple to use "day-timer" and log of all your activities . Thus reliably saving everything you do is of prime importance . And what you do may be executing an expression , including defining a new word , in the open Forth the environment is written in by tapping "F6" instead of hitting return . The Forth is written directly in x86 assembler . But at the everyday level the vocabulary is based on dynamic lists of lists evolved from APL and K . Thus 4th.CoSy ( is a very powerful very succinct very broad programming environment for total control of your machine . On a USB CoSy ( ( , you can conveniently take your environment to any WinTel computer . We will discuss What it is , Where it is , And Where it's headed -- which largely depends on where people want to take it . Browse ( for the entire story , and download a copy of 4th.CoSy ( to try on your own WinTel machine and bring with you to the MeetUp .


Bob Armstrong

Bob Armstrong learned Ken Iverson and IBM Research's APL when facing the need to learn multidimensional math in grad school in the mid '70s and left FORTRAN and Algol behind for ever seduced by the ability to interactively bash his head against the computer until he understood the math . While consulting at Xerox in the early '80s learned of Chuck Moore's , also interactive , also functional , Forth , the minimal vocabulary building a dictionary capable of extending itself . 4th.CoSy ( melds of these two poles of programming languages into a notekeeping environment . See for a more compete, well, vita .

Website Sponsor: HSC Careers (
Food Sponsor: Apex Systems (
Door Prize Sponsors: Jetbrains ( - Software license (Several products to choose from)
Book Sponsor: OReilly Publishing ( - Technical books