At the BASIC prompt ], type: PRINT PEEK (64447) Hit return. If it returns a 255, you have the original rom version, a 0 indicates the Unidisk version, a 3 indicates the memory expansion version, a 4 indicates a bug fix version and a 5 is a IIc+. ---------------------------------- On Tue, 25 Apr 2000, Jan wrote: > How can I tell which version I have? By serial number, firmware?