Does anyone know of a (preferably UK/EU) source of HP type plotter pens,
suitable for the 7470A pen plotter?
IRIC the 7470 is the 2 pen model with a pen holder at easch end of the
carriage rail. The carrage moves off-limits to pick up or put down a
pen.. II also seem to rememebr that soem pens are too long to fit in the
unit, but all 'standard' HP ones work.
As an aside, there are at least 3 versions of the 7470. The common ones
are RS232 or HPIB. The 'Opt 003' is much desired in some circles. It has
an HPIL interface, and was used wit hthe HP41 and HP75 handhelds. There
is even a pltoter ROM module for the HP41 (which contains programs to
drvei said plutter ) and a 'graphics solutions book' (programs on
magnetic cards to draw bar chrats, pie charts, etc) for the HP75.
 Acutally, said OM wil lwork with just about any HPIB plotter using
HPGL commans if linekd up via an HP82169 interface. It does not work with
RS232 plotters (linked via an HP82164).
It seems most of my coloured pens have dried out while the plotter was
in storage, leaving me with a single pack of Roland XD-4SPA 0.2mm black
pens and a couple of of unbranded, considerably thicker black pens.
I wonder what the solvent in the original ink was. I asusme that jsut
thew solvent has evaporated and that the pigments, etc, are still there.
If you could find a suitable solvent you could probably get the old pens