The following are some exhibits being used by respondents (purpose: Non Infringement)
January 28, 2013 Deposition Transcript of Russell H. Fish
Letter Fish to Higgins, dated September 11, 1991
United States Patent No. 4,931,986
Patent Defense: Fish to Higgins, dated May 12, 1992
United States Patent No. 4,037,090
Document entitled "The PSC1000 Microprocessor"
And this one is for invalidity
Excerpt from Mostek 3870 Single Chip Micro Family