IBM System/370 Guide

2. Spanned variable-length (OS VBS) format tapes, written in EBCDIC,
that are produced by the Tape Preprocessor program or as a
result of 7080 emulation on a Model 165. These tapes can be
read by both System/370 and emulated 7080 programs.
VBS format tape volumes can be processed on a nine-track 2400
tape unit or a 2400 tape unit with a seven-track head and the
Data Converter feature. These volumes can have unlabeled data
sets or standard OS labels in addition to 7080 labels. Note
that VBS format files also can be processed on direct access
devices.
Table 40.20.1. 7080 hardware and I/O devices supported by the 7080
Emulator program for the Model 165
7080 Feature
7080 system with 80,000 or
160,000 positions of storage, and
up to four 7080 communication
channels. (705 I, II, and III
programs that can be executed
on a 7080 system can be emulated
also, subject to Model 165 7080
emulator restrictions.)
7153 console
7502 Console Card Reader
729 II/IV/V/VI Magnetic Tape
Units
Model 165 Equivalent
Model 165 with the 7080
compatibility Feature, 512K or
more, channels (2870, 2860, or
2880), and an MFT or MVT control
program that includes a 7080
Emulator program and the interval
timing, ATTACH, and IDENTIFY
options. A 1024K system is
required for emulation of a 7080
with 160,000 positions of main
storage, using MVT.
OS system console
1442 Card Read Punch
2501 Card Reader
2520
Card Read Punch
2540
Card Read Punch
Any I/O device supported
by
OS QSAM
Any System/370 tape unit or direct
access device supported by OS
BSAM. VBS format is required for
direct access device emulation.
2400 tape units with the Seven-
Track Compatibility Feature are
required to handle 7080 mode
tapes.
Table 40.20.2. 7080 I/O devices and features not supported by the 7080
Emulator program for the Model 165
7622 Signal Control, associated units, and related instructions
7908 Data Channel, associated devices, and features (including control
storage bank 4) and related instructions (ENABLE COMPARE BACKWARD)
7080 RPQ features and related instructions
7340 Hypertape Drive
1301 and 2302 Disk storage
ASU zoning contained in multiply, divide, and lengthen instructions
Customer engineering diagnostic instructions
Automatic restart indicator
OS job control and 7080 emulator control statements must be present
for each emulated 7080 object program. Existing 7080 programs and
their control statements need not be modified unless they use facilities
not supported by the Model 165 7080 Emulator program.
67

IBM System/370 Specifications

General

Brand	IBM
Model	System/370
Category	Server
Language	English