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This error comes up whenever I start up the system. I've tried three different keyboards. If i button mash a little the screen changes and says: MFM-150 monitor, version 2.9 memory size: 640k bytes. enter "?" for help. Any key I press generates some random character. Any help is appreciated.

Any information on this model specifically would be appreciated. All I can find is info on 158-4x models. Thanks!