Unusual HP-21 ?

[jch]

Hi,

I've just received my first red LED's HP!
But unfortunately, it exhibits the problem described in this thread: http://www.hpmuseum.org/forum/thread-264...ight=hp-21

I took a look at the internals and it seems the PCB is not the same as usual.
It has got an AMD 1820-1983 (power-on reset, battery low comparator) and a dedicated power supply converter.

Did someone already encounter this version?

I have to check if there is some noise on the power supply, and if unsuccessful it will become a host for Panamatik's Woodstock low power module!



s/n: 1710S23250

Jean-Christophe.