Thanks for those links Ian. I will take a look. Here (for what they are worth) are my config.g and homex.g files. They are virtually un-modified from the files downloaded with the 1.23 firmwareconfig.g homex.g

I have just upgraded the firmware on my Ormerod 1 printer from v1.17 to 1.23.
I added the Mini Height Sensor from MiscSolutions which worked fine with v1.17, but after upgrading it does strange things! Sending the Home X command the head goes straight past the sensor and bangs up against the end stop until I switch off.
I contacted DC42 via PM and he told me that I needed aM574 command in my config.g file, however he did not say what parameters I needed with it. Can anyone help please. Are there any other commands which need adding/modifying?
Thanks
Peter