IBM System/370 Guide

associated buffer. For example, a 1403 Printer attached to
a 2821 control unit connected to a 2880 channel operating in
block multiplexing mode disconnects from the channel during
print time and carriage motion. Reconnection occurs when the
channel is free,. to transfer the data for the next line to the
2821 buffer in burst mode.
6. Any other I/O device that presents channel end without
simultaneous device end disconnects from the 2880 when command
chaining if it is operating on a nonshared subchannel.
Section 60 discusses planning for the installation of block
multiplexer channels and RPS devices.
10:30 STANDARD AND OPTIONAL SYSTEM FEATURES
STANDARD FEATURES
34
Standard features included on the System/310 Model 165 are:
• Instruction set that includes binary., decimal, and floating-point
(including extended precision) arithmetic, the new general purpose
instructions, and the instructions required to handle the new
architecture. New System/310 instructions are the following:
COMPARE LOGICAL CHARACTERS UNDER MASK
COMPARE LOGICAL LONG
HALT DEVICE
INSERT CHARACTERS UNDER MASK
LOAD CONTROL
MOVE LONG
SET CLOCK
SHIFT AND ROUND DECIMAL
START I/O FAST RELEASE
STORE CHANNEL ID
STORE CHARACTERS UNDER MASK
STORE CLOCK
STORE CONTROL
STORE CPU ID
• CPU retry
• Interval timer - 3.33 ms resolution
• Time of day clock
• Expanded machine check interrupt
• Direct Control
• ECC on processor storage
• Byte boundary alignment
• Storage and Fetch Protection
• High-speed buffer storage - 8K
• Attachment feature for up to seven channels (2810, 2860, and 2880)
• Channei retry
• Writable control storage

IBM System/370 Specifications

General

Brand	IBM
Model	System/370
Category	Server
Language	English