Xerox 900 series Technical Manual page 66

METHOD:
(cont .)
SUMMARY OF
OPERATIONS:
CORE: X7777 UAT
(11 )
Unit Assignment Table
BAT
(11 )
Business Assignment Table
BRU
DUMP (1)
Li nkage to Memory Dump
BRU TYPSM (1)
Linkage to Symbol Tbl.Dump
CAT
(11 )
RAD EOM/SKS Table
RAD BOOTSTRAP
(19)
Bootstrap MONARCH
FILE POINTERS
(12)
File Management Pointers
RAD PACKAGE (389)
RAD File Mgt.Package
BUFFERS
(192)
RAD I/O Buffers (3)
META-SYMBOL
RESIDENT
(103)
Overlay Loader
QBOOT
(1 )
Li nkage to Bootstra p
BRU QBOOT (1)
o
ERASABLE
(1)
RAD storage allocation is based on the concept of two concurrently active fi les.
When the system is generated, these are S (the System File) and D (the Direc-
tory). After the system is generated, Sand D are closed, and the remaining
storage is used for the
Xl
and
X2
files. Since
X2
and BO (BI) are not simul-
taneouslyactive, they both share the same file;
X2
is defined as beginning
immediately after the BO fi I e.
Rewind
Calling sequence: BRM
00
*QSYS
FDT
Rewind and open file whose number is specified in the fourth word of the file
descripti on tab'1 e. Words two and three are ignored.
Open
Calling sequence: BRM
01
*QSYS
FDT
Open the file whose number is specified in the fourth word of the file descrip-
tion table. Words two and three are ignored. "Open" corresponds to an
61