That is what is displayed after the back has been opened. It will continue to display "1000" until there have been three shutter/wind cycles. If you don't already have one, you can download a copy of the manual from the Pentax Web site or from the Butkus site (
Pentax Super Program, pentax super A,)
Just so you don't feel dumb, this question comes up fairly frequently from new owners of these two cameras.
If you are seeing "1000" at other times, there is the chance that the switch that detects whether the film door is closed is not working properly. Jammed with gummed up bad light seal foam perhaps?
Steve