TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

GLOSSARY
Absolute virtual address
AC
A fixed location in user virtual address space that cannot be
relocated by the software. However, it can be translated to a
physical address by the hardware. For example, locations 0 - 17
are mapped into the current AC block by the hardware. The
corresponding locations in physical memory are never referenced.
Refer to accumulator.
ACCESS.USR
Each user can create his own ACCESS.USR file to specify who
and cannot access his files. See Appendix C.
can
Access date
The date on which a file on disk was last read or written. If a
file has not been read or written since it was created, the
creation date and the access date are the same. The access date
is kept in the Retrieval Information Block (RIB) for the file.
Access privileges
Attributes of a file that specify the class of users allowed to
access the file and the type of access they are allowed.
Access table
A table stored in the monitor that reflects the status of a file.
There is one access table for each file that is open for reading
or writing, in addition to those files that were recently closed.
This information is kept in the monitor in order to decrease the
time needed to access the files.
Accumulator
One of the registers and associated equipment in the arithmetic
unit in which data can be placed while it is being examined or
manipulated (for example, the 16 high-speed registers at address
locations 0 through 17).
Gloss-1