Release Notes
                       for PC-DBMS
                       version 1.2


This   text   describes   cumulative   corrections    and 
performance improvements to PC-DBMS to remedy problems or 
shortcomings.  The  User's  Guide for PC-DBMS version 1.0 
is  in   MANUAL.*   (or   PC-DBMS.DOC)   and   cumulative 
enhancements are documented in ADDENDUM.TXT.  



                CORRECTIONS IN VERSION 1.1


DOCUMENTATION

The User's Guide contained a repeated error on pages  3-4 
and  3-5.  The  illustrated  select  ...  where  commands 
produced error messages.  In the  current  User's  Guide, 
the  three  occurrences of the incorrect string "=>" have 
been replaced by ">=".  


DISPLAY UTILITY

The display ... where command was improperly parsed under 
some  circumstances  producing  a spurious error message.  
This problem has been fixed.  

The default qualifier on the display command was  \query.  
In  the  current version,  it is \edit in conformity with 
the User's Guide.  


EDITING OF FLOATING POINT ENTRIES

User entered numbers and numbers read from data files are 
converted to binary in a consistent  manner.  In  version 
1.0,   inconsistent  conversion  algorithms  occasionally 
caused equal floating points numbers to be converted into 
unequal binary numbers resulting  in  failure  of  the  = 
where clause operator.


SCREEN ATTRIBUTES ON EXIT

Version 1.1 sets screen attributes to white characters on 
black  background  upon exiting.  Version 1.0 left screen 
attributes as they were in the command window.  


SCREEN HANDLING

The output window, the message and column heading stripes 
are now output by  writing  directly  to  display  memory 
enhancing performance. 


                CORRECTIONS IN VERSION 1.2


SELECT AND DISPLAY UTILITY

The select and display ...  where  commands  occasionally 
failed  to retrieve qualifying records when doing a keyed 
look up on = and <> operators.  Problem fixed.  


DISPLAY UTILITY

The display utility sometimes  improperly  handled  index 
updates  when  a record was deleted or modified.  Problem 
fixed.  Also, when an index was used to retrieve a record 
which was then deleted,  the first  record  in  the  file 
might be overwritten.  Problem fixed.  


SELECT COMMAND

The select ...  sorted by ...  into ...  command produced 
an unusable target table.  Problem fixed.