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PDP-10 Archives
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tops20tools_v6_9-jan-86_dumper
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tools/dsconv1/dsconv.mem
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D S C O N V
This is a program to produce 1032 DMD (Data Definition) files
from 1022 datasets. It optionally also dumps ASCII data record files.
AUTHOR: Coleman P. Harrison
DATE WRITTEN: June 28, 1983
DATE MODIFIED: April 18, 1984
C O P Y R I G H T
(C) 1983, 1984
Copyright Software House
N O T I C E S
This program is in no way intended as a piece of production
software. As such, neither the author nor Software House assumes any
responsibility for its functioning. Absolutely no support is intended
or implied.
This program (in part or total) may be freely copied for any
non-profit purposes. All copies must include the above copyright and
these notices. Any reproduction (in part or total) of this software
for profit or any reproduction which excludes the above copyright and
these notices will be considered grounds for punitive legal action.
Users are encouraged to mail their name and address to:
Coleman P. Harrison
Software House
1105 Massachusetts Avenue
Cambridge, Massachusetts 02138
If and when new versions are produced we will consider notifying
all users so identified. We are, of course, also interested in
hearing about any enhancement. We assume no responsibility for
supporting this program.
D E S C R I P T I O N
The purpose of the program is to provide an automated method to
convert System 1022 datasets to System 1032. It runs with 1022 on a
DECSystem-10 or -20. It asks for a filespec, obtains information on
the dataset(s) in it by means of calls on DBINFO, and produces a 1032
DMD which can be used to CREATE analogous 1032 dataset(s) on a VAX.
Optionally, it will also dump each dataset's data to a DMI file.
Page 2
Attribute names, abbreviations, key status, and ranges are
copied.
1022 single integer attributes have the default range of -2**35
to +2**35-1 unless the user defined a range. Double integers,
available starting with Version 116 of 1022, can range as high as
2**71. This program translates such integers to 1032 double integers
whose range is up to 2**63. However, if the 1022 data exceeds 2**63,
this will produce conversion errors during the load to 1032. To
retain more than 63 bits (18.9 decimal digits) of precision, the 1032
Decimal datatype must be used; the required syntax is noted in a
comment in any datasets in which this problem could arise so that the
user could then edit his/her DMD file.
In most cases, one can't improve on the 1032 default formats
without knowing what the data looks like; usually, the default
results will be closer to what 1022 displays than any other choice,
although the results are usually not exactly the same as the output
from 1022. One main difference is that 1022 chooses the width of each
occurrence of each attribute according to its individual value, but
1032 does so for the attribute itself based only on its range and
precision. The A format with no width is available in 1032 beginning
with V2.00; it is the default in 1022, and the user may want to
specify it for text attributes if the space-filling behavior is
desired.
The program does assign a format for real attributes, since in
that case, while there is no single 1032 format that replicates 1022's
behavior in all cases, the E+10.4 choice comes closer than the
default. Formats are also included in the RD's for dates; this is
necessary so that the output of 1022's DUMP command will be readable
by 1032. RD_Missing items are included so that blank text attributes
will not become MISSING in 1032.
Prompts are generated by replacing underscores with spaces and
capitalizing the first letter of each word. Titles are the same as
prompts except that lines are broken where appropriate.
Dataset and database names are truncated to 9 characters (after
eliminating any underscores). This is not strictly necessary, but it
is advisable because the user has to be more knowledgeable to handle
those with longer names. (Filenames (such as DMI, DMO, DMD, and DME)
would have to be specified each time one is needed, or else RMS would
choke on the name 1032 generates.) DMI file names are truncated to 6
characters for compatibility with old TOPS-10. Unique names are
generated if these truncations result in several datasets or DMI files
having the same name.
M O D I F I C A T I O N S
1. Double length 1022 integers (available starting with Version 116)
are now supported (but see the above discussion).
Page 3
2. Single length integers whose value is greater than 2**31, i.e.
which are in the double integer category for 1032, now load
correctly.
3. Integer of identification, date of entry, and date of change are
now supported (available in 1032 starting with Version 2).
4. Dates dumped with a length of 6 or 7 are now specified as Format 5
so that they will be read correctly by 1032.
5. The program can now be run with Version 114 of 1022; however, if
there is more than one dataset stored in a file, Version 114
cannot retrieve the dataset names, so the program uses DS1, DS2,
etc.
I N S T A L L A T I O N
The tape was written on our DECSystem-20 at 1600 b.p.i. using
DUMPER under TOPS-20 version 4.1. It contains two copies of the
following files:
DSCONV.REL
DSCONV.EXE
DSCONV.MEM
If you are using version 116A of 1022 on TOPS-20, you can run
DSCONV.EXE. Otherwise you should reload DSCONV with your system's
version of 1022 by means of:
LOAD DSCONV, SYS:HR1022/LIB
SAVE
If you have any questions, please call Coleman Harrison at (617)
661-9440.