Partition Or Region Layout For An Os 1400/7010-Series; Emulator Program Job Step, With General Storage; Requirements Indicated - IBM System/370 145 Manual

operating system to stand-alone emulation mode of system operation
is not required.
• The ability to extend or add applications such as graphics,
teleprocessing, time sharing. e1t.c., because a dedicated emulation
environment is no longer requir4~d and more system resources are
available in a given time period.
• The ability to process certain -1400/1010-series tape and disk data
sets, using both system/310 and emulated 1400.l1010-series programs.
Existing 1400/1010 tape files can be converted to a standard OS data
format using the IBM-supplied Tape Preprocessor formatting program.
Existing 1400/1010 disk files must be converted.
• More efficient use of direct access space, since both 1400/1010 and
System/310 data sets can be plaeed on the same disk volume.
• Device independence for emulatolr-supported I/O devices used by
emulated 1400/1010-series progra.ms that handle data sets in OS
variable-length spanned (VS) or variable-length spanned blocked
(VBS) data format. OS access m.~thods are used to handle I/O
operations so that new functions and I/O device support added to the
access method routines used by 1:.he emulator programs are
automatically available to emulated 1400/1010-series jobs. Tape and
unit record 1400/7010-series £ijles can be emulated on system/310
direct access devices.
The two emulator programs provid4~d for the Model 1-45 use simulation
routines, compatibility feature micJt:'oprogram instructions, the Model 145
instruction set, and OS superviso:r and data management routines to
emulate 1400/1010-series program op~~rations. QSAM is used for unit
record emulation, BSAM is usedfo:r it.ape emulation, and BDAM is used for
disk emulation. Figure 40.05. 1;
ShOl!lS
the general layout of an emulator
program partition or region and ind:~cates the range of processor storage
requirements for both emulatorproglrams. Note that 1400/7010· storage is
simulated in contiguous Model 145 sit.orage (each 1400/7010 position is
simulated by a byte).
1401/1440/1460
2K to 10K
Partition or Region
OS Data lo1anagement
Routin~~s
Buffers a.nd Control
Blocks
::::
Availabl~~
Storage
1410/1010
2K to 10K
2K to 16K 1401 systems
2K to 16K 1440 Systems
8K to 16K 1460 Systems
Simulated 1400/7010
Storage (size of
system being
emulat.~d)
10K to 80K 1410 Systems
40K to
lOOK
1010 Systems
Approximately
21K to 36K
Emulator Routines Approximately
23K to 461<
Figure 40.05.1. Partition or region layout for an OS 1400/1010-series
emulator program job step, with general storage
requirements indicated
The specific emulator program to
be
used by an ins.tallation must
be
constructed via an emulator generation procedure, which produces the job
A
Guide to the IBM System/310 Model 145
159