diff --git a/blog/2019-02-23-resurracting-an-hp-7440a-plotter.markdown b/blog/2019-02-23-resurracting-an-hp-7440a-plotter.markdown index ea10511..ef8654f 100644 --- a/blog/2019-02-23-resurracting-an-hp-7440a-plotter.markdown +++ b/blog/2019-02-23-resurracting-an-hp-7440a-plotter.markdown @@ -1,6 +1,6 @@ --- layout: post -title: "Resurrecting an HP 7440A plotter" +title: "Resurrecting an old plotter" date: 2019-02-23 comments: true tags: plotter, art, python, hardware, recurse @@ -146,8 +146,8 @@ A re-reading of the manual made us realize HP sold these functionality as an [hardware adaptor board that plugs in the bottom](https://support.hp.com/us-en/document/bpp01354), which we don't have. -But everything in computer graphics is a line anyway right? With some [roots of -unity](https://support.hp.com/us-en/document/bpp01354) we came up with a circle +But everything in computer graphics is a line anyway right? With some [root of +unity](http://mathworld.wolfram.com/RootofUnity.html) math, we came up with a circle drawing routine.