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Compaq COBOL for OpenVMS VAX and
Compaq COBOL Compatibility and Migration
Compaq COBOL is based on and is highly compatible with Compaq COBOL for
OpenVMS VAX, which runs on the OpenVMS VAX system. However, there are
differences, which are summarized in this appendix. This information can help
you develop COBOL applications that are compatible with both products and
can help you migrate your Compaq COBOL for OpenVMS VAX applications to
Compaq COBOL on the OpenVMS Alpha operating system, the Tru64 UNIX
operating system, or the Windows NT Alpha operating system.
B.1 Compatibility Matrix
Table B–1 shows the current (as of the date of publication of this manual) state of
compatibility for numerous features in Compaq COBOL Version 2.7 on its three
platforms and Compaq COBOL for OpenVMS VAX Version 5.7. Always check
the Release Notes for the latest developments if there is a question about the
availability of a given feature.
Legend
= Supported
N = Not supported
P = Partially supported
Table B–1 Cross-Platform Compatibility of COBOL Features
OpenVMS
VAX
OpenVMS
Alpha
Tru64
UNIX
Windows NT
Alpha
ANSI-85/-89 HIGH
ANSI-85 REPORT WRITER
Standard arithmetic N P P P
Table sort N
Tape handling N
Segmented keys
/CHECK=DUPLICATE_KEYS
NN
Relaxed key checking N N
RMS special registers
NN
RMS APPLY extensions NN
/STANDARD=V3 PPP
ANSI-74 FILE STATUS support
(continued on next page)
Compaq COBOL for OpenVMS VAX and Compaq COBOL Compatibility and Migration B–1