That level of usability is something I would love to see PLT Scheme achieve. I used them for many years and actually donated one to a computer museum about 10 years ago. <div class="gmail_quote">On Mon, Mar 15, 2010 at 7:55 AM, Johan Coppieters <<a href="mailto:johan577@mac.com">johan577@mac.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">The most beautiful thing I ever saw during my years in computer science at the Brussels Free University. A Symbolics Lisp machine ! So open, so clean, so pure, well integrated, etc ... these guys were good. Now it also seems they were the first ever to register a domain name: <a href="http://symbolics.com/" target="_blank">http://symbolics.com/</a> It seems the genera environment survied somewhere in a corner of the Internet. <a href="http://www.symbolics-dks.com/Genera-1.htm" target="_blank">http://www.symbolics-dks.com/Genera-1.htm</a> Anyone an idea if the lisp sources are somewhere available? The system was so open, that even the scheduler (that was ofcourse written in Lisp) could be changed while the system was running. Johan Coppieters. -- Gistelse Steenweg 577 8200 Brugge - Belgie Tel. +32 (0) 50 32 14 07 Fax +32 (0) 50 32 14 06 <a href="http://www.duo.be" target="_blank">http://www.duo.be</a> E-mail: <a href="mailto:johan577@me.com">johan577@me.com</a> _________________________________________________ For list-related administrative tasks: <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a> </blockquote></div>