VMTAPE REPLY command can no longer be abbreviated to R.
We could do this in r1.8. What changed?
This was a change that came with VM:Tape r2.0.
Based on the other VM:Tape commands that start with "R", it made sense in the common nucleus conversion that the minimum length to uniquely identify the intended command as "REPLY", was set to 3 characters. Others commands are REFRESH, REJECT, RESUME, and RMS.
VM:Tape will accept REP, but not any abbreviation less than the three letters.