IBM System/370 Manual page 10

P,;ge of r.c20-1730-0
Revised i 1/20/70
By TNL GN20-2277
512K to 3072K of four-way, doubleword int€rleaved, two-
microsecond processor storage is available - three times the
maximum available on the Model 65.
Byte boundary alignment is permitted for the operands of non-
privileged instructions to eliminate the necessity of adding padding
bytes within records or to blocked records for the purpose of
aligning fixed or floating-point data.
Error checking and cor~ection (ECC> hardware that automatically
corrects all single-bit processor storage errors and detects all
double-bit and most multiple-bit errors is standard •
• I/O devices for the Model 165 are as follows:
Most currently announced I/O devices for System/360 Models 65 and
above can be attached.
The new 3330 facility is available for attachment to 2880 channels.
It offers significantly faster seeks and more than twice the data
rate of the 2314 facility, more than three times the capacity of
the 2314, and automatic error correction features. The new
rotational position sensing and multiple requesting capabilities
announced for the 2305 facility are standard.
The 3330 has an 806 KB data transfer rate, average seek time of
30 ms, and full rotation time of 16.7 ms. Up to 800 million bytes
can be contained on an eight drive facility.
The 2305 facility Models 1 and 2 can be connected to 2880 channels
to provide significantly faster data transfer operations.
The Model 1 has a 3 megabyte data rate, a maximum module capacity
of 5.4 million bytes, and average access time of 2.5 ms.
The Model 2 has a 1.5 megabyte data rate, a maximum module
capacity of 11.2 million bytes, and average access time of 5 ros.
The new high-speed 3211 Printer with a tapeless carriage and an
alphameric print speed of 2000 lines per minute is available.
The tapeless carriage decreases operator intervention by eliminating
carriage tape loading and unloading.
The new 3803/3420 Magnetic Tape Subsystem is attachable. Models
3, 5, and 7 of the 3420 Magnetic Tape Unit, with data rates of
120 KB, 200 KB, and 320 KB, respectively, at l600-BPI recording
density, are provided. Phase-encoded recording, which automatically
corrects all single-bit read errors in-flight, is used. This new
tape subsystem offers improved price performance; Dual Density and
Seven-Track features for compatibility with, and conversion of,
2400-series tape volumes; greatly reduced operator handling through
implementation of such features as automatic tape threading and
cartridge loading; lower cost tape switching than is currently pro-
vided; and enhanced reliabilty, availability, and serviceability
features .
• Extensive hardware and programming systems error recovery and
repair features are provided to improve system reliability,
availability, and serviceability •
• Compact physical design reduces Model 165 CPU and processor storage
space requirements. The Model 165 CPU has three times the number
of circuits as a Model 65, in excess of 75,000 versus 25,000, yet
a 512K or 1024K Model 165 requires the same amount of space as
a 512K Model 65.
As the highlights indicate, Model 65 and 75 users have a broader
range of Model 165 configurations to choose from than before when
tailoring a growth system with improved throughput and expanded 3
capabilities.