An ongoing list of z/Architecture assembler things that you forget if you don't use them often enough

This blog entry will be updated and reposted whenever I come across things that I should remember but my brain has forgotten due to infrequent contact with the item.

• TRT munches GPR2. That's why the subsequent compare failed miserably.
• Man, there are a lot of SVCs and PCs that won't work in AR mode. Make sure you switch out of AR mode before calling macros like WAIT.