IBM 4381 Manual page 91

• System/370 Extended feature (common segment bit, INVALIDATE PAGE
TABLE ENTRY instruction, low address protection, TEST PROTECTION
instruction)
TEST BLOCK instruction
Time-of-day clock (one-microsecond resolution)
The following are standard features for 4381 Model Groups 14 and 3 that operate
only when System/370 mode is in effect:
• BC mode
Block multiplexer control bit in control register 0
Channel masks in control register 2
Channel retry data in a limited channel logout area
Dynamic address translation for 24-bit virtual and real addresses using 2K or
4K pages and 64K or 1024K segments
ECPS:VM/370
External signals
Interval timer
INSERT STORAGE KEY instruction
Instructions for System/370 architecture (includes all defined except READ
DIRECT, WRITE DIRECT, RESUME I/0, and channel set switching
instructions)
• Limited channel logout
Machine check external damage code
Preferred Machine Assist
• Recovery extensions
RESET REFERENCE BIT instruction
Segment protection
SET STORAGE KEY instruction
STORE CHANNEL ID instruction (and all other System/370 I/0
instructions)
SIOF instruction fast release and queuing (comparable facilities are inherent in
the System/370-XA mode channel subsystem definition)
VM Extended Facility Assist
128 to 2048 UCWs in increments of 64
The following are standard features for 4381 Model Groups 14 and 3 that operate
only when System/370-XA mode is in effect:
Bimodal addressing
Channel subsystem designed for System/370 extended architecture
DIAGNOSE MSSFCALL instruction
Dynamic address translation for 31-bit (or 24-bit) virtual and real addresses
using 4K pages and 1024K segments
Instructions for System/370 extended architecture (includes all defined for
System/370 extended architecture)
Page protection
Tracing
Sort assist
Up to 2048 subchannels
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A Guide to the IBM 4381 Processor