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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⟧ »CSP004_V0801.D!CSS126.D!RELDESCR.T« 

TextFile

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

*******************************************************




Module id number: CSS/126
-------------------------

Module name:      Magtape-interface, MTC & DMTC
-----------------------------------

Actual release:   02.04            Release date: 860606
-----------------------            --------------------

Previous release: 02.03            Release date: 850403
-----------------------            --------------------




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

   >>V0201<<    (does not concern DMTC)

   INIT_MTC must be supplied with the controller's device addr in R1
   in order to facilitate tape programs running the MX-AMOS operating
   system which does not allow a device with current device addr (#1F).
   An MX-AMOS address is a 16 bit integer with three compartments :
   bit 15-12: crate no
   bit 11- 6: zero
   bit  5- 0: device addr


Changes:
--------

   >>V0204<<

   DAMOS version not carried on.

   When receiving an interrupt, it is now checked whether the
   operation has completed. If not, a new interrupt is awaited.
   This together with the two changes in V0203 and V0202 should
   form a consistent interrupt handling which can tolerate both
   missing and superfluous interrupts.

   MTC now sees whether it runs MX- or (X)AMOS from the value
   of the context words BASE and UMAP. If the are the same,
   it is assumed, that it is an MXAMOS system.

   >>V0203<<  (Does not concern DMTC)

   When a time-out occur the TCR bit is tested :
   if the MTC is busy then a fatal error occur else a warning is given.
   (The PKK project is having trouble with read operations being timed out)

   >>V0202<<    (does not concern DMTC)

   After receiving an interrupt the interrupt queue is cleared by
   calling MON CLEARINTERRUPT. Thus the problem of redundant inter-
   rupts in CR80 MX is solved except of cause the downgraded per-
   formance.
   (MX PR ???)

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


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


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

  PR 86369

Comments:
---------
 «a5»