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of the system disk must be reinitialized, i.
e.,
when
subsystems, processors, libraries, user programs, etc., as
well as RBM itself must be written anew on the system disk.
The UPD option is used for an update SYSGEN where the
current disk area sizes and locations remain the same, and
only RBM itself need be replaced.
In this case, if the
size of the resulting (new) RBM file on the system disk is
greater than the current one, the entire SP area, at least,
will need to be reloaded (via the procedures described in
Chapter 5).
Messages issued by phase 2 will indicate to the user the
several categories of programs that may require subsequent
reloading due to SYSGEN changes to RBM.
For example,
changes in memory allocation for the public library, resi-
dent or nonresident foreground, or background will require
reloading of the affected user programs.
The PA option is used for making permanent patches to the
resident RBM modules (obviating the necessity for subse-
quent boot-time patching). After the patches are applied,
the request for an ALL or UPD option is reissued.
The
message LOAD NONRESIDENT MODULES indicates the
point at which the second, nonresident module fi Ie wi II be
searched and read from.
After the required nonresident
modules have been loaded, phase 2 outputs a map of the
symbols defined within RBM. On completion, the SYS LOAD
phase termi nates by a transfer of control to the RBM boot-
strap routi ne, and the standard sequence of system startup
messages is encountered.
Detai led operational descriptions of both SYSGE N phases
are presented below, following a description of the system
release tape or card deck format.
SYSTEM-RELEASE TAPE FORMAT
The system is distributed on magnetic tape, paper tape, or
punched cards.
The format of the released materials is
logically identical in each case; only the magnetic-tape
form, however, will contain all of the standard processors
distributed with the system (this does not affect the SYSGE N
process). We will describe a typical system release in
magnetic tape form, noting any operational differences if
the paper tape or card deck form is uti I i zed.
The general format of the system release tape is shown
pi ctoria Ily in Figure 6,
It consists of a number of fi les,
only the first three of which are involved in the SYSGEN
process itself. These first three fi les contain, respectively,
the SYSGE N program (and its bootstrap), the complete set
of resident RBM modules, and the complete set of non-
resident RBM modules or "overlays" (certain of which may
optionally be made resident).
These three files consist ex-
clusively of binary records.
All of the succeeding files consist of "normal
II
jobs for the
new RBM system to be created from the three files just de-
scribed. These jobs load the RBM subsystems and standard
processors that are supplied with the system.
The first
job loads an absolute copy of the Overlay Loader subsystem
by means of the ABS loader.
All of the following jobs
utilize the Overlay Loader and the RAD Editor as required.
The fi les representing these jobs contain a combination of
control commands and object module records.
Loading of
the system processors is described further iR Cl:Jopter 5
DEANITION-PHASE OPERATION
Operation of the SYSGE N definition phase (phase 1) in-
volves first the loading of SYSGEN and then the entering
of input parameters.
LOADING SYSGEN
Whether the initial hardware load operation is performed
from magnetic tape, punched cards, or paper tape, the
computer enters the wait state twice during the loading of
SYSGEN:
1.
Followi ng loading of the bootstrap record.
2.
Following loading of the SYSGEN program itself.
The devi ce address of the keyboard/printer to be used for
the first SYSGEN operator exchange must be set up on the
DATA switches prior to clearing the second wait state. The
step-by-step procedure is as follows:
1.
Perform the standard hardware load procedure from the
selected SYSGEN input device, e, g., a magnetic tape
unit with the PROTECT switch in the off position and
the PARITY ERROR (Sigma 2/3) or FAULT (Model 530)
switch set to HALT.
2.
Clear the first wait state encountered (i. e., COMPUTE
switch to IDLE, then back to RUN).
3.
Set the PARITY ERROR or FAULT switch to INTRPT,
and set in the DATA switches the device address of the
keyboard/printer (i. e., theoperator's console) to be
used later for the first request/response interaction
(request: "I NPUT DEVICES").
4.
Clear the second wait state encountered.
At this point, the initial sequence of SYSGEN messages
wi
II
be typed on the selected keyboard/printer (step 3,
above), as follows:
RBM SYSGEN
INPUT DEVICES
The first message indicates the successful loading of SYSGEN
and initiation of phase
1.
The second message is a request
for an input parameter, which is described below.
·System-Release Tape Format/Definition-Phase Operation
25
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