GA144 Devboard Pool?

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Re: GA144 Devboard Pool?

Postby rickman » Sat, 20 Nov 2010 01:31:05 GMT





I may not entirely understand your directions, but I would not attempt
to solder a chip like this without at least a stencil so the solder
paste sits only on the pads.  When you say you "think" in can be done,
I expect that means you have not tried it...  I know of no one who has
soldered a similar device the way you describe.

If there is interest, I am already considering development of a
development board that could be cheaper than the GA board.  If there
is any volume to offset the NRE costs, it could end up being rather
inexpensive.  Of course the parts count could be kept very minimal and
specific parts added by the user.  I typically use all leaded parts to
allow hand assembly where possible.  I still say a TSSOP has as small
a total footprint as a BGA...

Rick

Re: GA144 Devboard Pool?

Postby Mux » Sat, 20 Nov 2010 02:39:13 GMT






LOL. I Like it :-) First dibs on outer I/O nodes!

-Mux

Re: GA144 Devboard Pool?

Postby Mux » Sat, 20 Nov 2010 02:39:13 GMT






LOL. I Like it :-) First dibs on outer I/O nodes!

-Mux

Re: GA144 Devboard Pool?

Postby John Passaniti » Sat, 20 Nov 2010 04:13:50 GMT



It's increasingly clear that you have some emotional investment in all
this that transcends the actual conversations in the various threads
in and around the GA144.  I don't understand it, but that's okay
because that's your private burden, not mine.

I don't think the idea of an online shared GA144 board is terribly
compelling given the existence of simulations of the chip.  I also
don't like pumpkin-flavored ice cream.  Others are free to think
whatever they like and find value in whatever they like.

I don't know what exactly is negative about my comments about a group
purchase.  I suggested waiting until more details about the evaluation
boards are available and I suggested if there is interest is to set up
an escrow account to manage the money.

Re: GA144 Devboard Pool?

Postby rickman » Sat, 20 Nov 2010 04:22:21 GMT





Lol...  Yes, "emotional investment"...  Lol

Rick

Re: GA144 Devboard Pool?

Postby Mux » Sat, 20 Nov 2010 04:26:13 GMT





Why does *every* thread eventually turn into some sort of he-said/she-
said {*filter*} fest? Seriously. FWIW, I put down my 50% deposit which
kinda puts this thread to sleep (pun wholeheartedly intended :-)

-Mux

Re: GA144 Devboard Pool?

Postby Paul Rubin » Sat, 20 Nov 2010 04:30:59 GMT

John Passaniti < XXXX@XXXXX.COM > writes:

Well, it's less a matter of taste and opinion than of what you want to
do with the chip.  The simulation probably runs at .001 of the speed of
the chip at best, probably a lot slower, even if it has a way to use a
multicore PC.  The simulation may also be inaccurate, e.g. with regard
to timing, given the asynchronous nature of the chip.


I wouldn't say your comments were negative, but I'd say your interest in
the precise issues of interfacing the board to special hardware aren't
necessarily shared by everyone.  Some of us would be satisfied with some
reasonable way to communicate with the board and run programs on it, for
the purpose of developing and testing algorithms without too much
immediate concern for special hardware interfaces.  The board does seem
to come with something like that (serial port, external ram, eforth
interpreter).

Re: GA144 Devboard Pool?

Postby rickman » Sat, 20 Nov 2010 05:00:03 GMT







I want node 705.  Then I can control the Flash boot!

Rick

Re: GA144 Devboard Pool?

Postby Brad » Sat, 20 Nov 2010 05:39:39 GMT


I've done it maybe a dozen times, but I have a microscope. I think a
handheld magnifier would be okay. I haven't tried a Home Depot style
heat gun, just the hot air from a rework station. As I said, I don't
use a stencil. The solder beads up onto the pads and there are some
bridges but not too many to fix. Sloppy paste placement just makes
more solder balls.

This is not production, just prototyping. I would want a stencil to do
BGA, and if I could get a good view of the chip and adjacent discretes
I'd be comfortable using a heat gun for reflow. This kind of do-it-
yourself stuff is Forth-like, since it depends on you knowing what
you're doing and accepting the mess if you{*filter*}it up.

--Brad

Re: GA144 Devboard Pool?

Postby John Passaniti » Sat, 20 Nov 2010 05:52:27 GMT



I'm not sure.  You take this thread for example.  rickman wrote that I
have "said nothing positive about the idea and only made negative
comments."  If you can find the negative comments I made regarding the
idea of a group purchase of a GA144 evaluation boards, I'd be
interested.


I don't see why.  You may no longer be interested in setting up a
group purchase, but I still am.  Again, my interest is conditional on
the final description of the boards (I'm not going to pay up to $450
if the board doesn't do what I want), and on a having a protected way
for members of the group to make the purchase.  I don't think either
is unreasonable or "negative."

Re: GA144 Devboard Pool?

Postby rickman » Sat, 20 Nov 2010 05:54:27 GMT



I would actually be interested in{*filter*} a GA144 eval board on a
server so others can access it over the web.  I think that would be a
realistic way for folks to share a board... or I might just buy a
board myself if someone will help me hook it on to the web.  I'm not
too up on interfacing to the Internet other than using a browser.

The eval board IDE interface seems to be serial I/O, one for each chip
and a third serial port for the eForth console.  I'm not sure how the
reset should be managed, but it might be done using the handshake from
one of the serial ports.  Otherwise it would require adding a switch
for power to the board I guess.

The point is this is very doable in spite of my jokes about node wars
and such.

Rick

Re: GA144 Devboard Pool?

Postby John Passaniti » Sat, 20 Nov 2010 06:03:47 GMT


> special hardware aren't necessarily shared by everyone. 

Well no apologies there.  I tend to be a practical, pragmatic kind of
guy, and if I buy one of the evaluation boards, it's specifically to
evaluate the chip for the applications I do work in.


Re: GA144 Devboard Pool?

Postby Brad » Sat, 20 Nov 2010 08:23:27 GMT


Another option is to work out a trade. Do some of their work for them
in exchange for a discount. You seem qualified and they don't have a
shortage of things that need to be done.

-Brad



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