Sean wrote:
> Where are you considering to put the oscillator module? =


They pretty much have to go on the personality card.  My current idea is =
to
have the personality card just in front of the ZIF, with the OSC module(s=
)
sticking out horizontally as low as possible (to minimize trace length to=

them).  The silkscreen chip insertion diagram would be above them.

> Can we have a combined "personality/oscillator" modules?

Too wasteful.  Remember that all but the 8-pin personality card will have=

options for a Timer1 oscillator as well - covering all of the reasonable
permutations for all the chip sizes results in about 36 total cards
totalling 1.5 square feet...

> Only one question at this stage. What do we do with the SIP connector
when
> not in use? Do we need to isolate it at all?

I don't see any need to worry about it.  The four spacers should be
somewhat longer than the pins: the idea is that the Designer and the
breadboard should sit flat on a common surface when connected together.  =
(I
wanted a separate breadboard so that I could keep multiple sets of
peripherals wired up on different breadboards - or the other edge of the
same breadboard - and simply swap them around as needed rather than havin=
g
to tear down and rebuild every time I switch projects.)

What are the manufacturability concerns with having through-hole parts
mounted on the bottom of the board (such as the breadboard connector)? =

Some of my ideas for laying out the personality & osc cards would also ha=
ve
that feature, and I need to know how strongly to resist them...
        Jason Harper

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu