Classic Epson printer emulators
ard at p850ug1.demon.co.uk
Sun Jan 31 15:11:19 CST 2010
> Dave McGuire wrote:
> > Dedicated thermal receipt printers are nice, but from what I've heard
> > they're not as reliable as dot-matrix impact printers in the field.
> > That seems odd to me, but I guess the heating elements dying does make
> > some sense.
> There's one major issue with direct thermal: ink fade. Basically the
Indeed. Many older (HP) calculators used thermal paper. It'sa good idea
to make photocopies (or I guess scans these days) of any printouts you
want to keep.
It's not generally realsied that themral printouts fade with time. I was
chatting to somebody from a major museum and he didn't realise the
historically-significant calculator printouts needed to be copied _NOW_.
> printing fades over time. Some retailers love this, because after about
> 8 months the receipt is basically blank -- "Sir, we'd be happy to accept
> that under the 12-month guarantee, but we need a receipt -- not a blank
> strip of paper."
> For bonus points: heat and light make it fade quicker. Leave a
> thermal-print receipt on a windowsill on the 1st of the month and it'll
> be blank by the end of the month. Leave it on or near a radiator and
> it'll go completely black within a few minutes.
Needless to say a soldering iron works just as well. I've been known to
use one to check if the paper is still thermally sensitive, and to see
which is the sensitive side.
> There are also significant chemical compatibility issues. Most notably,
Propan-2-ol will darken most thermal paper, as I fopudn out the hard way
when clening a bit of hardware with said solvent and some othe spray
landed on some printouts from my LogicDart (it uses the HP82440 IR
> applying a strip of Sellotape to a thermal-printed slip/receipt causes
Pehaps I've been lucky,but I've not had any prolems sticking down HP
calculator printouts with 3M 'magic tape' onto a piece of plain paper to
make them easier to copy.
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