AST RESEARCH, INC.         TECHNICAL BULLETIN #0878               12-2-93




           GHOST RAM DETECTION WITH THE POWER EXEC 4/** SL SYSTEM


PROBLEM:       Ghost RAM is reported when using QEMM versions 6.2 and 7.01 on
               the Power Exec 4/** SL system.

CAUSE:         QEMM does a check of the CPU and while there leaves a "ghost"
               of itself. This results in a "phantom" that is detected when
               doing a RAM area check using utilities such as Manifest. This
               "ghost or phantom" image interferes with some network cards
               being recognized when installed into the Power Station.

EXAMPLE:       Expanded / Pages
                     n=048C      Memory Area   Size   Logical Page
                  0n00 U+++      0400 - 9FFF   624K      4 - 42
                  1n00 ++++      C000 - CFFF    64K      0 - 3
                  2n00 ++++
                  3n00 ++++
                  4n00 ++++
                  5n00 ++++
                  6n00 ++++
                  7n00 ++++
                  8n00 ++++
                  9n00 ++++
                  An00 UUUA------------"ghost RAM image"
                  Bn00 UUUU
                  Cn00 FFFF
                  Dn00 UUUU      + = Mappable
                  En00 UUUU      F = Page Frame
                  Fn00 UUUU      U = Unmappable

SYSTEMS
AFFECTED:      All models of the Power Exec 4/** SL system using QEMM
               versions 6.2 and 7.01 .

SOLUTION:      Quarterdeck has indicated that the problem is with their code.
               A new version (7.02) has been released and is available.