    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.