IBM sold a lot of dedicated RPG systems called "System 38" and "System 36", back when the early Mini-Computer (mid-size, not medium power) industry got started. These were not really up to the level of DEC's well-known mini- products, but fairly popular. RPG is a simple programming language that was (AFAIK) just used with these "almost mini's".
The AS 400's are closer to being Mini's, and replaced both of their "System" series. They were introduced in the early 1980's, and I believe are still being sold. They started out using a proprietary OS that was straight command line style. The growth of the PC industry took away the bottom end first, then the mid-level, part of the market that the AS 400 was aimed at, quite rapidly. Almost no one other than the founders of Compaq, and Michael Dell, seemed to be able to predict the extent of the desktop computer revolution.
DEC is no more, having been swallowed up by Compaq, prior to its merger with HP. If the current AS 400 has a graphical interface now, I haven't heard about it, but I did end up being retired some while back, well before I was ready for it, and have been out of the news loop for "Enterprise Computing", so I'd be unlikely to know.
:disgust: