Paul<p>Having a few weird issues trying to get this US Cutter Plotter to work reliably, and it turns out one of the issues is bad HPGL output from Inkscape. This handy dandy protocol analyzer let me sniff the serial traffic and confirm that the latest Inkscape was actually outputting incorrect HPGL<br>A rectangle correctly plotted from Inkscape 1.3 in Windows: <br>IN; PU; SP1, PU12255,2318; PD16319,2318,16319,794,12255,794,12255,2318; PU0,0; SPO; IN;</p><p>The same file from 1.4 on the Mac:<br>IN; PU; SP1; PU10,10; PD10,4084,15,4083,19,4079,20,4074,1544,4074,1543,4069,1539,4065,1534,4064,1534,0,15</p><p>Weird, right? Well at least I can stop second guessing myself. Bug report filed, and maybe I'll try it form Linux next. </p><p>The other thing to look out for on these cutters: They don't respond to any of the Output Instruction commands - so you can't see the status, limits, or anything else. It is also pretty basic in the commands that it executes. It'll do lines, and that's about it.</p><p><a href="https://oldbytes.space/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>retrocomputing</span></a> <a href="https://oldbytes.space/tags/penplotter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>penplotter</span></a> <a href="https://oldbytes.space/tags/hewlettpackard" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hewlettpackard</span></a></p>