Many years ago, I learn RISC assembly using his book
https://www.amazon.com/Introduction-RISC-Assembly-Language-Programming/dp/0201398281<p>and started working on his exercises, which used to be available at:
https://www.scss.tcd.ie/john.waldron/itral/quests/quest.html<p>Now I want to continue my work. Maybe someone still keep the tar file?