Hello,
I realize this is an old topic, but we have had several requests like this. The following link was sent to me and might be of interest for someone looking to try out the mainframe. . .
http://www.ibm.com/developerworks/downl ... index.htmlOther than the following quote (which is on the linked page), i don't know anything about the "sandbox" - if it is like other similar offerings, it has a time limit.
Try out IBM mainframe and enterprise modernization products running in a cloud environment. Hands-on exercises step you through real-world scenarios. No installation required! Here for the first time? Set up your system and access the self-help information to get the most out of your experience.