Do remember there are no regulators in the PX8 PSU. The
power supply must
be close to 5V (4.8V is OK), not a random unregulated one. You may well
do a lot of damage with the latter.
The standard adapter for the HX-20, PX-8 and PX-4 delivers 6 V DC at
600ma. If you use a regulated 6 V or lower power supply, the machine may
work, but batteries will not be charged. At
http://www.xs4all.nl/~fjkraan/comp/hx20/adapter.html you can find some
more info on proper power supply.
-tony
Fred Jan