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AST RESEARCH, INC.              TECHNICAL BULLETIN # 0990             9-29-94

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                     PREMIUM EXEC PRODUCT VARIATIONS INFORMATION


                   Exec 386SX/20                   Exec 386SX/25       Exec
                                                                      SX/25C
HARDWARE
Top Level
P/N         500795     500843      500843       500850    500867      500884
Enclosure   Original   Seamless    Seamless     Original  Seamless    Seamless

(1)Video
Type        Rev B      Rev B       Rev C        Rev C      Rev C      Color
Motherboard
P/N         202390-001 n/a         202390-004  202390-003  202390-003 202478-002

            202390-002 202390-002                          202390-004

(2)Processor
Board       Actel      MIKI        MIKI        MIKI       MIKI       MIKI
Processor
Board P/N   202392-002 202410-002  202410-002  202410-003 202410-003 202410-010
System BIOS 1.06-1.09  1.12-1.17   1.12-1.17   1.12-1.17  1.12-1.17  2.00-2.02
Keyboard
BIOS        1.03&1.04  Inc. in     Inc. in     Inc. in    Inc. in    Inc. in
                       ASIC Chip   ASIC Chip   ASIC Chip  ASIC Chip  ASIC Chip
BMC BIOS    1.04-1.06  1.04-1.06   1.04-1.06   1.04-1.06  1.04-1.06  1.06

1MB SIMM
(80ns)      Yes        Yes         Yes         n/a        n/a        n/a
1MB SIMM
(70ns)      n/a        n/a         n/a         Yes        Yes        Yes
4MB SIMM
(80ns)      Yes        Yes         Yes         n/a        n/a        n/a
4MB SIMM
(70ns)      n/a        n/a         n/a         Yes        Yes        Yes
Laplink
Serial
Cable       Yes        (3)Yes/No   No          No         No         Yes

DOS Version 3.3        3.3 & 5.0   5.0         5.0        5.0        5.0

SOFTWARE
System
Utilities
P/N         910401-031 910401-033  910401-034  910458-031 910458-031 910458-032
Traveling
S/W
Utilities   Yes (3)    Yes/No      No          No         No         No

User's
Manual      Yes        Yes         Yes         Yes        Yes        Yes
DOC-
UMENT-
ATION
Pocket
Reference   Yes        Yes         Yes         Yes        Yes        Yes
DOS Manual  Yes        (3)Yes/No   No          No         No         No
Laplink
Manual      Yes        (3)Yes/No   No          No         No         No
Battery
Watch ManualYes        (3)Yes/No   No          No         No         No

Notes:
(1) Rev C Video identifies the enhanced video chipset and, unlike Rev B
    Video, supports "hardware        expand".
(2) Actel identifies the original board and has two removable chips; Keyboard
    and System BIOS, and is no longer shipped with new systems.  MIKI
    identifies the ASIC version of this board and has only one removable chip,
    the System BIOS.
(3) Yes/No indicates that this item was originally shipped and then later
    removed.  Yes indicates this item is currently being shipped.


SYSTEMS
AFFECTED:         AST
              PART NUMBER          DESCRIPTION

              500795-XXX      PREMIUM EXEC 386SX/20
              500843-XXX      PREMIUM EXEC 386SX/20
              500850-XXX      PREMIUM EXEC 386SX/25
              500867-XXX`     PREMIUM EXEC 386SX/25
              500884-XXX      PREMIUM EXEC 386SX/25 COLOR