[svfig-announce] Meeting Aug. 22, 2009
forther at comcast.net
Wed Aug 19 19:50:15 BST 2009
3 DAYS AWAY!
--- SVFIG Meeting Aug. 22, 2009 ---
Please note that the times listed below are precise but not
accurate. We might go a little long or short on any agenda
item. If you're desperate to see something at a particular
time, please let us know! Remember that there are bugs in
any non-trivial SVFIG meeting announcement.
We'll be on the fifth floor of Terman Engineering Center --- Room 556
Directions and map links are below.
There are two buildings named Terman on campus so be careful. The
Searchable Map has the one you want as "TERMAN (FREDERICK E) ENGRG
CENTER (04-700) 380 PANAMA MALL"
The Official SVFIG Announcement Editor's Parking Lot recommendation is
the lot near the intersection of Teresa St and Morris Way.
10:00 --- COFFEE AND A CHAT
10:14 --- Videos from July 2008 SVFIG Meeting Continued
That month Cogswell wasn't available, so a few members convened at
Ting's meeting house in San Mateo. Masa taped presentations and
some of the rest of the meeting and we'll all have a look.
Was Bill Ragsdale there? Dave Jaffe WAS there so this will include:
Interesting Items - Volume 11 - Video from July 2008 - Dave Jaffe
Dave continued his survey of interesting newly-introduced
microcontrollers, I/O peripherals, sensors, products, and gadgets that
can provide useful and unique capabilities to Forth embedded systems.
We may stop the video and look up some of the items on the Internet,
discuss them and explore a little.
11:40 --- LUNCH
On campus most likely, but open to discussion.
To avoid the "noon lemming effect" we'll go to lunch a little before noon.
13:00 --- Introductions, Announcements, Rumors, and Random Access
13:23 --- Computing Logarithms and Exponentials - Eric Smith
The most common algorithms to compute approximations of transcendental
functions (including exponentials and logarithms) use polynomial
approximations. Such algorithms are well-suited to microprocessors with
high-performance floating-point hardware, but are extremely slow
otherwise. Since many embedded systems use processors without
floating-point hardware, algorithms that do not require multiplication
14:28 --- Five Topics for Discussion - Jim Harrison
1. Why floating point isn't "friendly" - it isn't associative - and
how to make it so. Opinion: it isn't worth the trouble.
2. While I'm waiting for GreenArrays (GA), hello XMOS. This will
consist of bringing an XMOS board and chips for show and tell. I have a
development board; hopefully the chips will arrive by Friday.
3. Community building in Forth? An invitation for people to
collaborate on porting a Colorforth to XMOS, including documenting the
whole process so as to serve as a tutorial for Forth porting in general.
Why collaborate? I haven't done it yet, and have never done anything
like this before. Why XMOS? Simple instruction set, not very expensive,
and chips are available.
4. Quaternions in Forth. Using quaternion multiplication as topic
for discussing and illustrating "good" (and bad?) Forth programming. The
discussion will start with browsing a thread I started in the Colorforth
list and continue with the Colorforth virtual machine versus other Forth
VMs and how that impacts coding style.
5. Opening session of the Haypress Creek Fan Club. I'm sure other
SVFIG members are reading Chuck's blog. I have questions, perhaps others
do as well, and perhaps we can discuss them together.
16:00 --- Adjourn (maybe earlier if we run out of gas)
The schedule above may be reformatted or line-justified but
please transmit verbatim or not at all. Any font you like is
alright with me.
No Newsgroup posts or other media distribution this month please!
Wireless Internet access is anticipated (though not guaranteed) at
Stanford, so bring your wifi-enabled laptop.
Coming to SVFIG:
* Bring speaker suggestions TO EVERY MEETING!
* PLANNING FORTH DAY 2009 - EVERY MEETING
* Mitch Bradley's Forth in C (somebody needs to volunteer)
* I've sent an email to the implementer of the PACE FIG-Forth and he
responded. I think he got the idea that my invitation to present was
'one-time' rather than 'any time'. Hopefully when there is something
else PACE-related on the program he'll join us and present.
* Furthering the Cause of Forth - John Rible
IntellaSys has imploded, or something. We'd be pleased to hear about
John's new outreach project when formulated.
* Engineering TV
Fifty engineering topic channels. Four new episodes per week.
* BOTBASH 2000 --- Video
A cheepie video of a May 2000 robot rumble in Mesa Arizona from these
* Meet the Mac --- Kevin Appert
I'm having trouble emailing Ward McFarland, the Carbon MacForth guy. If
anybody knows a good way to buy a copy, fill me in! The email doesn't
bounce but it doesn't get answered. The phone number is out of service
but the web site is still up.
I'm also getting error boxes when I try to start PowerMops under OS-9.1,
so if anybody wants to help out there I'd be grateful.
Check the SVFIG web site at http://www.forth.org/svfig/
for last minute changes to this schedule.
The most up-to-date meeting information is at
Many thanks to our wonderful Webmaster, Dave Jaffe.
Preliminary agenda along with schedule updates and
discussion may frequently be found on the SVFIG email list.
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Terman Engineering Center can be found on these maps - just search for
Terman: (going to maps.google.com gives an erroneous result)
Searchable Stanford Campus Map: http://ucomm.stanford.edu/cgi-bin/map/
There is open parking on weekends. Park in any A or C or metered space,
no coins needed even if there's a meter there.The Official SVFIG
Announcement Editor's Parking Lot recommendation is the lot near the
intersection of Teresa St and Morris Way.
Go to the Stanford links, Google maps has no idea where Terman is!
The building's door may be locked, there will be a number to call posted
after the meeting starts and we will come down and check once in a while.
Once you reach Terman, take the elevator to the 5th floor. Walk across
the foyer and up the ramp just to the left of the glassed-in office.
Room 556 is at the top of the ramp - entrance on the left.
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