I recreated the PDP-8 minicomputer instruction set reference card in case you want to print one out. Hey, I don’t know. Maybe you’ll need it. Just saying. 

https://github.com/GrantMeStrength/retro/tree/gh-pages/PDP

https://media.hachyderm.io/media_attachments/files/111/150/303/606/939/041/original/628127633065f23b.png