Optional Features - IBM 4381 Manual

Optional Features
• 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 11, 12, 13, 1, and 2
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
Sort assist
Tracing
• Up to 2048 subchannels
Optional features for 4381 Model Group 11, 12, 13, 1, and 2 Processors, all of
which can operate with System/370 or System/370-XA mode in effect and can be
field-installed, are:
3205 Color Display Console, 3278 Model 2A Display Console, or 3279 Color
Display Console Model 2C (includes printer-keyboard mode for System/370
mode only and display mode for System/370 and System/370-XA
modes)-required feature
Block Multiplexer Channels, Additional (provides six block multiplexer
channels)
Channel-to-Channel Adapter (one maximum)
Remote Operator Console Facility (specify feature-no charge)
Remote Support Facility (recommended specify feature-no charge)
60
A Guide to the IBM 4381 Processor