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•
Multiprocessing (includes SET PREFIX, STORE PREFIX, SIGNAL
PROCESSOR, and STORE CPU ADDRESS instructions)-implemented in
4381 Model Groups 14 and 3 only
•
Channel Set Switching (CONNECT CHANNEL SET and DISCONNECT
CHANNEL SET instructions)
•
Compatibility features for emulation of other processors (1401/1440/1400
Compatibility, for example)
•
Certain control program assists (such as OS/VSl assist, APL assist, and
OS/DOS Emulation)
•
Certain processor dependencies
Control and problem programs written for System/370, 4300 System/370 mode,
or 30XX Processors can be run without modification in a 4381 Processor operating
in System/370 mode that has a comparable hardware configuration, with the
following exceptions:
1. Programs that depend on facilities that are not defined in the System/370
architecture for 4381 Processors (READ DIRECT, WRITE DIRECT, Channel
Set Switching instructions, for example)
2. Time-dependent programs. (They may or may not run correctly.)
3. Programs that depend on results defined in the System/370 Principles of
Operation
(GA22-7000) to be unpredictable or processor-dependent
4. Programs that use unassigned fields in processor formats (instruction formats,
for example) that are not explicitly made available for program use
5. Programs that depend on interruptions caused by errors, such as unassigned
operation codes or command codes
System/370 architecture as implemented in 4381 Processors provides the ability to
execute:
•
4300 System/370 mode control and problem programs that are not
time-dependent or 4300 Processor-dependent
•
4300 problem programs that are designed to operate with 4300 ECPS:VSE
mode control programs and that are not time-dependent or 4300
Processor-dependent. (A 4300 ECPS:VSE mode control program cannot
execute in a 4381 Processor.)
•
System/370 or 30XX control and problem programs that are not
time-dependent or System/370 processor-dependent
•
System/360 control and problem programs that are not time-dependent or
System/360 processor-dependent
22
A Guide to the IBM 4381 Processor
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