AST RESEARCH, INC.         TECHNICAL BULLETIN #0853               08-02-93




                            POWER EXEC SIM MATRIX


When selecting an Alternate, always choose low power (LP) part first.  An
80ns part can be used in a system that uses 80ns DRAMs.  Standard power parts
(SP) should always be picked last.  Items marked with an "n/a" indicates an
incompatibility with that Processor Board.


                      Power Exec Processor Board Part Numbers

                 386SL/25     486SL/25 3.3V   486SL/25 5V    486SL/33
                202476-002      202530-001    202569-001    202569-002

2MB 80NS LP
202486-003       Alternate         n/a          n/a           n/a

2MB 80NS LP
202531-001       PRIMARY           n/a          n/a           n/a

4MB 80NS LP
202486-004       Alternate         n/a        Alternate       n/a

4MB 80NS LP
202531-002       PRIMARY           n/a        PRIMARY         n/a

4MB 70NS LP
202531-003       Alternate         n/a        Alternate     PRIMARY

4MB 70NS SP
202531-004       Alternate         n/a        Alternate     Alternate

4MB 80NS LP
202521-001 3.3V    n/a            Alternate     n/a           n/a

4MB 80NS LP
202558-001 3.3V    n/a            PRIMARY       n/a           n/a

8MB 80NS LP
202487-003       PRIMARY           n/a          n/a           n/a

8MB 80NS SP
202532-001       Alternate         n/a          n/a           n/a

16MB 80NS LP
202487-004       Alternate         n/a        Alternate       n/a

16MB 80NS SP
202532-002       Alternate         n/a        Alternate       n/a

16MB 70NS LP
202532-003       Alternate         n/a        Alternate     PRIMARY

16MB 70NS SP
202532-004       Alternate         n/a        Alternate     Alternate

16MB 80NS LP
202532-005       PRIMARY           n/a        PRIMARY         n/a

16MB 80NS LP
202522-001 3.3V    n/a            PRIMARY       n/a           n/a