M851 unrecognized command???

I have a Monoprice Mini v1 and have replaced the main board with a RAMPS 1.4 board and am running Marlin 1.1.xbf. I am having difficulty setting z offset and it would appear that I don’t have that selection on the LCD menu under control/motion. And using Pronterface to execute a M851 command it does not recognize the command. Is there some kind of flag that I set in the configuration files that might have produced this situation?

on bugfix 1.1.x you need any of these to enable M851

FIX_MOUNTED_PROBE
Z_PROBE_ALLEN_KEY
HAS_Z_SERVO_PROBE
Z_PROBE_SLED
SOLENOID_PROBE

So I am told by Monoprice that there is no Z Probe on the Mini V1. I am guessing that is the reason for the absence of those commands. Is there some other mechanism used in the software for that machine to derive the information ordinarily provided by the z probe?

Edited 1 time(s). Last edit at 04/30/2020 01:39PM by Rhartl.