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    Types: TextFile
    Names: »RELDESCR.T«

└─⟦e0c43619c⟧ Bits:30005797 CR80 Disc pack ( Vol:FNJ1 861029/EC CR80 S/W Package II+III+IV+V+VII )
    └─ ⟦this⟧ »CSP005_V0501.D!CSS321.D!RELDESCR.T« 
    └─ ⟦this⟧ »CSP005_V0501.D!CSS322.D!RELDESCR.T« 

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         R E L E A S E   D E S C R I P T I O N

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Module id number: CSS/321
-------------------------

Module name:      FLOPPY DISK DRIVER
------------------------------------

Module id number: CSS/322
-------------------------

Module name:      CDC DISK DRIVER
---------------------------------

Actual release:   05.04            Release date: 850313
-----------------------            --------------------

Previous release: 05.03            Release date: 841005
-----------------------            --------------------




New facilities:
---------------

  >> V0504 <<

  - (X)AMOS drivers can now run on MX type 2 HW provided that
    the (X)AMOS rules for storage is followed (FMS disk cache
    and driver inside the controller RAM).

  >> V0503 <<

  - The MX-CDC driver can now handle parity errors and will perform
    retry of operations if they do not occur too often.
  - (X)AMOS drivers checks, that the calling FMS lies in the same
    section as themselves.

  >> V0502 <<

  - It is possible to get statistics collection. This is an assembly
    time option.
  - A new command - CLEARVOL - has been introduced to allow FMS to clear
    volume statistics (if gathered) when new volumes are mounted.
  - A new command bit has been introduced (in MX-AMOS versions of
    CDC drivers) to allow the BACKUP program to avoid copying
    of sector buffers to-from the PU sector cache if the source
    and the destination disks are both on the same controller.

  >> V0501 <<

  - A new command, disk_shutdown has been implemented, which
    closes the driver.
  - Available in MX-AMOS versions.

Changes:
--------

  >> V0504 <<

  - None.

  >> V0503 <<

  - The drivers no longer uses saveevent and recoverevents.
    This is not necessary since all commands are executed in a finite
    amount of time and the list of free incoming requests is examined
    for being empty before awaiting a new command from outside.
    This gives a small performance improvement (especially in
    multi-CPU environments).

  >> V0502 <<

  - Error recovery strategy for writes is changed to only abort
    when bad sectors are detected.
  - CDC driver, MX-AMOS version, has been performance improved
    by making sector copying overlapped with new requests.

  >> V0501 <<

  - New improved strategy for recovery. Writing on disks and
    checkreading are NOT tried recovered.

  >> V0402 <<

  - Collecting of unit flags, when 'was seeking' bit
    is set in status, is changed to prevent deadlock.
    (CDC only).

  >> V0401 <<

  - Improved recovery for CDC cartridge disk drives
    (ref cpecr 312)

Errors corrected:
-----------------

  >> V0504 <<

  - Controller errors (HW timeouts etc) can now be tolerated in
    any situations.
  - (X)AMOS drivers refused all inclusions (assigns). This is
    corrected.

  >> V0503 <<

  - The handling of controller errors in MX versions corrected.

  >> V0502 <<

  - None.

  >> V0501 <<

  - The driver performs time-out of seek operations.
  - The driver refuses to recover operations on drives,
    that are not ready.

Reported errors, not corrected:
-------------------------------

CPECRs implemented in current release:
--------------------------------------

Comments:
---------