Re: ZipGS upgrading

[dempson@swell.actrix.gen.nz (David Empson)]

In article <jmk3.734717568@crux1.cit.cornell.edu> jmk3@crux3.cit.cornell.edu (Jay Krell) writes:
>
> As I said, I don't know hardware, but I'm pretty sure it is a crystal. The
> sorry-replacement for a hardcopy manual Hyperstudio stack shows two places
> for timing things, I think one is for crystals and the other oscillators.
> My socketed thing is up and left from the proccesor, and the empty solder
> pads (is that what they are called?) are to its right.

If you look at the printed legend on the ZIP circuit board, an
oscillator is connected in the area marked X1 (between the top of the
option switches and the expansion connector) while a crystal is
connected in the area marked X2 (between the large ASIC chip and the
expansion connector).

I think the things that you are calling 'solder pads' are actually
surface-mount resistors and capacitors (they're labelled C11, C13, R1
and C14).

The X2 (crystal) position has two pins to the left of the rectangle,
spaced correctly for a small crystal.  My ZIP (8 MHz) has a 32 MHz
crystal in this position.

The X1 (oscillator) position has 14 pins (it looks like two
alternative sockets, one 8-pin and the other 14-pin).  I don't know
where the oscillator pins are supposed to connect (it looks like
ground goes to pins 1, 4 and 7, +5V to pins 11 and 14, and the
oscillator output comes from pin 8).

BTW, my ZIP is a Zip GSX Ver 1.02, in case anyone is trying to compare
this with theirs.

The picture on the front of my ZIP's box shows a version 1.00 board,
which has a totally different layout in this area of the board.
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz    <--- Note my new E-Mail address!            
Snail mail: P.O. Box 27-103, Wellington, New Zealand