HP 28S REF and RREF

[edryer]

So after a while with my old Sharp EL 9900 (an old tank of a graphing calculator from 2000, my main workhorse picked up for less than $10) decided to start using the HP 28S again.

Very surprised there is no way on the HP to perform Matrix (Reduced) Row Echelon Form... i.e. no REF or RREF functions, was it not envisaged as useful for professionals? RREF would be a one step linear system solver!

Almost all later graphing calculators from most manufacturers had this functionality (as I assume does the HP 48SX and beyond).

To me a curious omission, as the HP 28S otherwise has great matrix/vector functionality (not as good as the 48's/50's with eigen stuff but still pretty good).