3. Installing the PuPla/2
Page 5
PuPla/2
2.2 The Construction
Regarding the order of construction we recommend first placing
the SMD components on the solder side and then the SMD
components on the component side. Next place the IC plug
adapter pins on the solder side and then the socket/SIL strips on
the component side. Finally, place the angled header pins and
the resistor under the PUF-GAL (2.2k from pin 6 to pin 24 of the
PUFCTRL GAL). As a tip for the IC plug adapter pins and the
SIL strips: a 64-pin socket helps in positioning when soldering.
In addition, pay attention to the correct position: the pin headers
for the mainboard are located closer to the edge of the board.
The location of the parts on the component side is clear from the
silkscreening on the board, but the position of the components
on the solder side is only apparent from the component layout
diagram in Appendix A. This is a result of cost considerations
which made further silkscreening impossible. The component
specifications can be found in the parts list in Appendix B.
3. Installing the PuPIa/2
3.1 Preparation
The CPU must be socketed in order to install PuPla/2 since it
must operate on or above the PuPla/2 board itself. If your CPU
is not socketed, then the best way to do this is to use a fine side-
cutter and snip the CPU pins close to the mainboard. Then you
can grab each pin remaining in the mainboard with some
tweezers and unsolder them. Afterwards, clean the holes with a
desoldering pump. Now the CPU socket (precision type!) can be
soldered in. The original CPU is now unusable, but an 8MHz
68000 doesn't even cost 10 DM. This is a small amount
compared to the unnecessary risk of ruining the mainboard with
a desoldering attempt. This procedure is the only "hurdle" for the
average user. You might be able to persuade a soldering friend
to help or, if necessary, please contact us. We also offer an
installation service.
Remember to unplug the power cord before performing any
work on the computer!