IBM System/370 145 Manual page 13

as is the time of day clock. The clock comparator can
be
used to
cause an interruption when t.he time of day clock passes a specified
value. These items provide higher resolution timing facilities than
the standard interval timer and enable more efficient timing
facility routines to
be
writ.ten ..
The byte-oriented operands f:acility permits byte boundary alignment
for the operands of nonprivileged instructions to eliminate the
necessity of adding padding bytes within records or to blocked
records for the purpose of a.ligning fixed- or floating-point data.
Retry of failing CPU operations is handled automatically by the
hardware, without programmin.g assistance.
• Functionally improved relocatable emulators are available that
operate under operating system control,. Concurrent execution of
system/310 programs. with any' combination of 1401, 1440, 1460. 1410.
and 1010 programs in a multiprogramming environment is supported.
The 1401/1440/1460 and the 1401/40/60, 1410/1010 Compatibility
features are optional, no-charge features. These emulators are
supported by DOS Versions 3 and 4, DOS/VS, and OS MFT, MVT, VS1, and
VS2.
• The standard OS/DOS Compatibility feature permits emulation of a
nos
Version 3 or 4 system under
os
(MFT, MVT, VS1, or VS2), concurrently
with execution of other OS jobs. Both DOS emulation and 1400/1010
emulation can operate together on a Model 145 under OS control.
• Operator console devices with an alter/display mode are available.
The 15-cps 3210 Mo~el 1 Console Printer-Keyboard or the 85-cps 3215
Model 1 Console Printer-Keyboard is required. A remote 3210 Model 2
Console Printer-Keyboard can be installed in addition to either of
the other printer-keyboards.
• The following channel featur,es are available for the Model 145:
Up to four high-speed selector channels can be attached (one
selector is standard) in addition to the standard byte multiplexer
channel. Up to 256 subchann1els can be installed on the byte
multiplexer channel. An individual selector channel can operate at
a data rate of .82 megabytes per second (MB). With a special
feature, a selector channel ,can operate at a 1. 85-MB data rate and
therefore .support significan-t:1y faster I/O devices than can Model 30
and 40 channels.
Block mu1 tiplexer mode of op1eration for selector channels is a no-
charge optional feature. A block multiplexer channel is a superset
of a selector channel. When used in conjunction with rotational
position sensing devices, sUlch as 3330-series and 2305 Model 2
direct access storage device:!3, block multiplexer channels can
increase total system throughput by permitting increased amounts of
data to enter and leave the l:iystem in a given time period. A single
block multiplexer channel Calrl support interleaved, concurrent
execution of multiple high-speed I/O operations.
The optional Integrated File Adapter feature allows lower cost,
direct attachment of 2314A-t:vpe disk drives to a Model 145. A
selector channel and a disk 4::ontrol unit are not required. The 2319
Disk storage units (Models A1 and A2 with three drives each), 2312
Disk storage (one drive)" 2313 Disk storage (four drives), and 2318
Disk storage (two drives) Calrl be . connected to the adapter for a
configuration of from three ito eight natively attached disk drives.
Facilities consisting of f:rom one to eight 2314-type disk drives,
plus a spare, can also be channel attached to the Model 145.
A Guide to the IBM System/310 Mociel 145
3