IBM System/370 145 Manual page 156

security measures will be required for this type of computing
environment.
IBM programming systems support of these trends in data processing,
by OS MFT, OS MVT, and DOS Version 4, has been growing and continues to
expand. The System/310 Model 145 offers hardware, I/O devices, and
performance capability required by the expanding computing environment.
30:10 OS MET AND MVT SUPPORT
OS MFT and MVT are modified and extended as of Release 20.1 so that
they support model-dependent hardware features of the Model 145
operating in BC mode. (PCP will not be extended to support model-
dependent features of the Model 145.) Appropriate alteration of the
. resident portion of an MFT or MVT control program (nucleus) generated
for a Model 145 will accommodate the BC mode fixed area of lower
processor storage in the MOdel 145. OS MFT and MVT support of the Model
145 includes currently announced OS facilities and additional support to
handle certain new Model 145 hardware features and I/O devices.
Emphasis also has been placed on extending error recovery, recording,
diagnostic, and repair procedures.
OS MFT and MVT support of Model 145 features and new I/O devices is
provided as follows (programming systems support of RAS features is
discussed in Section 50):
New instructions. Assembler F and Assembler H language translators
include mnemonics for the follow1ng System/370 instructions so they can
be used in user-written Assembler Language programs:
COMPARE LOGICAL CHARACTERS UNDER MASK
COMPARE LOGICAL LONG
HALT DEVICE
INSERT CHARACTERS UNDER MASK
LOAD CONTROL
MONITOR CALL
MOVE LONG
SET CLOCK
SHIFT AND ROUND DECIMAL
STORE CHANNEL ID
STORE CHARACTERS UNDER MASK
STORE CLOCK
STORE CPU ID
STORE CONTROL
An option to generate some of the new System/310 general purpose
instructions is provided 1n ANS Full COBOL version 3. The instructions
are INSERT CHARACTERS UNDER MASK (ICM), COMPARE LOGICAL LONG (CLCL),
MOVE LONG (MVCL), and SHIFT AND ROUND DECIMAL (SRP).
Extended preCision float.inq point. Assemblers F and H, FORTRAN H,
FORTRAN H-Extended, PL/I Optimizing Compiler, and PL/I Checkout Compiler
language translators support extended precision floating-point.
The implementation of extended precision support by FORTRAN Hand
PL/I is such that the language translators and the processing programs
they generate to include extended precision operations can operate on a
System/310 or a System/360 with or without extended precision hardware.
The language translator contains extended precision instructions and
generates them for processing programs that use extended preCision data.
A program check interruption occurs if an extended precision instruction
is executed and the feature is not present in the system. This
interruption causes the ·processing program to call in a subroutine (the
extended precision floating-point simulator) to handle extended
146 A Guide to the IBM System/310 Model 145