CBS, which in an experiment last summer put on five firstrun shows, will try it again this summer with four.

The lineup consists of: A Stephen King serialized novel-for-tv; a Rob Reiner sitcom, in which he will perform as well as co-produce; “The Verdict,” a reality-based half hour; and “True Detectives,” from producer Arnold Shapiro in association with CBS Entertainment Prods.

CBS also has in development for fall ’91 a series being created and written by Carrie Fisher for her mother, Debbie Reynolds.

Also, CBS is scheduling anniversary specials saluting “All In The Family,” “The Ed Sullivan Show” and “The Mary Tyler Moore Show” Feb. 16,17 and 18, respectively, packaged as a “Classic Weekend” as part of its sweeps assault.

The two-hour Sullivan spec will air at 9 p.m. Andrew Solt, who recently acquired the library from Sullivan’s estate, is exec producer.

The other specs will be one hour, with “Family” at 8 p.m. and “Moore” at 10 p.m. MTM is producing the Moore special, while Norman Lear’s Act III TV is doing “All In The Family” in association with Columbia Pictures TV, which has an output deal with Lear.

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