PAL60 is a television format that is sort of a hybrid of NTSC and PAL. It is used in many VCRs and DVD players to convert NTSC signals to PAL, sort of. Basically it leaves the signal in standard NTSC format (that is, 60 fields per second and 480 visible lines) but converts the color signal into the format that PAL TVs can handle. Many older TVs that could not display NTSC signals could handle PAL60 (a standard NTSC color picture shows on these TVs in black and white). Some of these need to have their vertical hold control adjusted to stop the picture from rolling. Some TVs can't handle either NTSC or PAL60. Why not convert the picture to PAL completely? Converting the color standard is a relatively trivial exercise. Converting the number of lines and scan frequency is a much harder undertaking. The professional equipment used to convert US TV shows to PAL for Europe and Australia costs tens of thousands of dollars. In recent years an increasing number of DVD players will do full NTSC to PAL conversion, sometimes with excellent performance, sometimes rather poorly. The poor ones typically produce a very jerky result.