Specifications
OpenVMS VAX Operating System, Version 5.5-2 SPD 25.01.37
• FIPS 50/ANSI X3.54-1986: Recorded Magnetic Tape
for Information Interchange, 6250 CPI (246 CPMM),
Group Coded Recording
• FIPS 79/ANSI X3.27-1987: Magnetic Tape Labels
and File Structure for Information Interchange
• FIPS 86/ANSI X3.64-1979: Additional Controls for
Use with American National Standard Code for In-
formation Interchange
• FIPS 151-1: Portable Operating System Interface
(POSIX 1003.1)
• Other FIPS not applicable
• POSIX 1003.1, 1988: System application program-
ming interface
• POSIX 1003.2, draft 10: Shell and utilities
• POSIX 1003.4, draft 9: Real-time programming
Note: Information regarding interchangeability of
ANSI and FED standards with FIPS is contained
in "ADP Telecommunications Standards Index," July
1988, published and maintained by the General Ser-
vices Administration.
• ISO 646: ISO 7-bit Coded Character Set for Infor-
mation Exchange
• ISO 1001: File Structure and Labeling of Magnetic
Tapes For Information Interchange
• ISO 1863: Information Processing — 9-track, 12, 7
mm (0.5 in) wide magnetic tape for information inter-
change recorded at 32 rpmm (800 rpi)
• ISO 1864: Information Processing — Unrecorded 12,
7 mm (0.5 in) wide magnetic tape for information in-
terchange — 35 ftpmm (800 ftpi) NRZI, 126 ftpmm (3
200 ftpi) phase encoded and 356 ftmm (9 042 ftpi),
NRZI
• ISO 2022: Code Extension Techniques for Use with
ISO 646
• ISO 3307: Representations of Time of the Day
• ISO 3788: Information Processing — 9-track, 12, 7
mm (0.5 in) wide magnetic tape for information in-
terchange recorded at 63 rpmm (1 600 rpt), phase
encoded
• ISO 4873: 8-bit Code for Information Interchange —
Structure and Rules for Implementation
• ISO 5652: Recorded Magtape (6250)
• ISO 6429: Control Functions for Coded Character
Sets
VMS Disk Block Requirements
Disk Space Requirements (Block Cluster Size = 2):
The disk block size for the VMS Operating System,
Version 5.5-2 after installation is approximately 107,600
blocks. This figure includes 5,600 blocks for page and
swap files. Most systems will require larger page and
swap files. This figure also includes Help library files
that are in data-compressed format. Most system man-
agers choose to expand these files (for faster access).
The expansion requires approximately 8,500 additional
blocks.
At least 67,000 free blocks are required in order to up-
date VMS V5.5 to VMS V5.5-2. Alternative installation
options are available for small operating system disk
configurations. Please refer to the VMS Versions 5.5-
2 Update Procedures for information concerning these
installation options.
To support full VMS, a system disk of greater than 100
MB is recommended. When a smaller disk is used,
additional tailoring is required prior to installing some
VMS options. This does not include the dump file space.
Refer to VMS Upgrade and Installation Procedures for
information on tailoring.
VMS DECwindows Disk Block Requirements
The disk block size for the complete VMS DECwin-
dows XUI environment after installation is approximately
68,000 blocks. This is in addition to the 107,600 blocks
required for the other components of the VMS Operating
System environment. A subset of the DECwindows en-
vironment can be installed. For example, programming
support need not be installed in a user environment.
The following list describes how many blocks are
needed for each section:
• User environment and applications — 14,000 blocks.
This section provides support for running VMS
DECwindows applications on VAX compute servers.
• Workstation device support — 19,000 blocks. This
number includes 2,800 blocks for the 75 dpi fonts and
3,900 blocks for the 100 dpi fonts. On 75 dpi sys-
tems, the 100 dpi fonts do not have to be installed.
On 100 dpi systems, both sets of fonts must be in-
stalled.
• Programming support — 32,000 blocks (approxi-
mately 3,500 per language). This number includes
support for all the programming languages. If only a
subset of languages is installed, the amount of disk
space will be less.
• Example files — approximately 3,000 blocks.
Note that the individual sizes add up to more than the
total because some components are shared by multiple
portions of the environment.
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