Introduction to RISC assembly language programming's codes?

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Many years ago, I learn RISC assembly using his book https://www.amazon.com/Introduction-RISC-Assembly-Language-Programming/dp/0201398281

and started working on his exercises, which used to be available at: https://www.scss.tcd.ie/john.waldron/itral/quests/quest.html

Now I want to continue my work. Maybe someone still keep the tar file?