This is what you get when you switch the Tube on with *CONFIGURE TUBE and do a hard reset. 512K! Oh yes!! You will see that nothing appears to be happening as the command prompt has not appeared. To the untrained eye this looks like you have gone into Hi-BASIC with the Tube switched off but in fact ADFS is trying to mount a disc. The drive light is illuminated waiting for you to put in the Master 512 DOS boot disc...