IBM 1130 User Manual page 474

Summary
Figure 60.2 illustrates the five logical disk areas
and shows the general properties of each.
Logical Area Sub-Areas
Cylinder 0
IBM Systems Basic
Area
Core I mage Buffer
FORTRAN
Compiler
Assembler
Fixed Area FLET
(FX)
Contents of
FX
User Area LET
(UA)
Contents of
UA
·
User data files
·
User programs
·
IBM subrou-
tine library
Working Contents of WS
Storage
(WS)
Section Subsections
Page
60
Present?
Always
Only on a systems disk
Can be removed from Non-Sys_
May be removed
May be removed
Not unless defined by user
Not unless defined by user
Always
Always. As delivered, the
UA contains the IBM
Subroutine Library
Always
10
I
60 01
Approximate Size, Sectors
Systems Non-Systems
Disk Disk
152
152
16 16
88 88
32 32
Fixed by the user when he
defines a fixed area
o
(LET is part
ofCyl. 0)
Varies as material is stored
and deleted
Varies in size - WS is
whatever is left over.
Every sector added to UA
is subtracted from WS;
every sector deleted from
UA is added to WS.
Figure 60.2. The five logical areas of the disk