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Fix whitespace errors

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Dhananjay Balan 2019-03-13 15:28:02 -04:00
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commit 3e814e99da
1 changed files with 17 additions and 17 deletions
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blog/2019-02-23-resurracting-an-hp-7440a-plotter.markdown
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@ -27,6 +27,7 @@ made working with raster images hard, and plotters didn't need much operating
memory. memory.
## HP7440A ## HP7440A
HP7440A _"ColorPro"_ was an affordable plotter manufactured by HP, it can hold HP7440A _"ColorPro"_ was an affordable plotter manufactured by HP, it can hold
and switch between 8 pens simultaneously and draw on surfaces as large as A4. and switch between 8 pens simultaneously and draw on surfaces as large as A4.
[HP Museum has a longer post about this [HP Museum has a longer post about this
@ -39,9 +40,9 @@ easy it is to open, take that 2018 tech!
![7440A Top cover open](/images/7440a_open.jpg){ width=600px } ![7440A Top cover open](/images/7440a_open.jpg){ width=600px }
The internal mechanism is pretty simple, There are two servos. One for The internal mechanism is pretty simple, There are two servos. One for moving
moving the paper back and forward, and the other for moving the pen left and the paper back and forward, and the other for moving the pen left and right.
right. There is also a solenoid based lever to switch pen down and up. There is also a solenoid based lever to switch pen down and up.
## Talk To Me ## Talk To Me
@ -60,11 +61,10 @@ Communication turned out be just standard serial, however our plotter has a
`DB-22` adaptor, so we had to use a `DB-22` to `DB-9` adpator and then `DB-9` to `DB-22` adaptor, so we had to use a `DB-22` to `DB-9` adpator and then `DB-9` to
`usb` adaptor. `usb` adaptor.
The final step was writing in the only language the plotter can The final step was writing in the only language the plotter can understand,
understand, [`HP-GL`](https://en.wikipedia.org/wiki/HP-GL) or [`HP-GL`](https://en.wikipedia.org/wiki/HP-GL) or `HP Graphics Langauge`. Lucky
`HP Graphics Langauge`. Lucky for us, HP was on top of the plotter game when for us, HP was on top of the plotter game when plotters were popular, so `HP-GL`
plotters were popular, so `HP-GL` has become a de facto standard has become a de facto standard for talking to plotters.
for talking to plotters.
.. and finally our plotter moves! .. and finally our plotter moves!