IBM System/370 Guide

advanced checkpoint/restart, OS 82
APR routine 81
architecture
design 6
implementation alterations 11
ASCII/EBCDIC mode 6, 9
block, buffer 21
Block Multiplexer Channel, 2880
addressing 24
data rate 25
general operation 29
I/O device operations on, summary 33
maximum number 24
operation with RPS devices 30
OS support 53
planning for optimal use
selector mode 28
subchannels 29
Two-Byte Interface Feature 25
buffer storage
access times 19
address array 23
activity lists 23
block definition 21
column definition 21
cycle time 19
disabling 21
Expansion feature 19
operation 20
organization 21
performance 19
replacement array 23
byte boundary alignment
description 18
OS support 53
Byte Multiplexer Channel, 2870
addressing 24
description 25
maximum number 24
OS support 53
CCH routine 80
channel available interrupt 29
channel logout 72, 80
channel retry 72
Channel-to-Channel Adapter 28
channels
addressing 24
Block Multiplexer, 2880 28
buffering 27
Byte Multiplexer, 2870 25
Extended Channels feature 24
general description 24
interference 24
loading examples 26
maximum number 24
OS support 53
priority 25
Selector, 2860 24, 25
circuits, number of 3
command retry 72
for 2305 facility 42
105

IBM System/370 Specifications

General

Brand	IBM
Model	System/370
Category	Server
Language	English