Mainframe Refresher by Muthu PDF Link: A Comprehensive Guide to Mainframe Computing
is widely considered a staple resource for interview preparation and day-to-day technical reference.
If you are looking for a reliable guide to brush up on legacy systems, Mainframe Refresher by Muthu
Academic Versions: A digitized copy of the refresher is hosted on Academia.edu for quick reading. Why It's Popular Mainframe refresher-part-1 | PDF - Slideshare
