30, 1982May 14, 1985International Business Machines CorporationLookahead I/O device control subsystemUS4583222 *Nov 7, 1983Apr 15, 1986Digital Equipment CorporationMethod and apparatus for self-testing of floating point accelerator processorsUS4677587 *May 14, 1985Jun 30, 1987Sanders Associates, Inc.Program simulation system including means for ensuring interactive enforcement of constraintsUS469