ZiLOG Z80 User Manual page 24

Step 8
Fit and solder capacitor C5.
The PCB allows for a radial or axial capacitor. In order to build a low profile board,
the capacitor should lay on its side. An axial capacitor would be most secure in this
configuration, but there is limited length allocated and you probably don't have one!
You can fit a radial capacitor on its side, but it is not as secure as an axial package as
both leads come out of the same end.
It is important to fit this capacitor the right way round. The
PCB's legend shows a plus and minus sign next to the round
outline of a radial packaged capacitor (bottom of image to left).
It also shows the alternative plus position for an axial capacitor
(top of image to left). In both cases the negative terminal is at
the bottom. The image to the right shows the typical marking of
the negative terminal of the capacitor.
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