by Darius Kazemi, June 30 2019
RFC-181 is titled “Modifications to RFC #177”. It's authored by John McConnell of NASA Ames Research Center and dated June 27th, 1971.
The technical content
This RFC fixes a problem with the graphics display specification in RFC-177. The problem is that the specification was supposed to make it impossible to draw outside of the border of the screen, but it turns out there are some ways to send coordinates that draw outside the border. So coordinates will now be “fractional displacements” from an origin.
There are also some tweaks made to make it easier to transform a graphics display list (aka a list of drawing commands) from one coordinate system to another.
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I'm Darius Kazemi. I'm an independent technologist and artist. I do a lot of work on the decentralized web with ActivityPub, including a Node.js reference implementation, an RSS-to-ActivityPub converter, and a fork of Mastodon, called Hometown. You can support my work via my Patreon.