IBM System/370 - Page 124

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Features
II. STORAGE
A. Processor storage
sizes
B. Processor storage
cycle
c. Processor storage
validity checking
D. Processor storage
reconfiguration
IE:.
Byte boundary
alignment permitted
for operands of
nonprivileged
instructions
F'. Storage and fetch
protection
System/360
Model 65
256K
512K
768K
1024K
750 nanoseconds (for
8 bytes). Two-way
interleaving of
sequential accesses
other than by the
channels is provided.
Pari 1:y checking by
byte. No hardware
error correction is
provided.
Not provided for
uniprocessor systems
No
Standard
512K
1024K
1536K
2048K
3072K
System/370
Model 165
2 microseconds.
storage is 4-way,
doubleword
interleaved for CPU
and channel requests.
32 bytes can be
obtained every 2
microseconds.
ECC checking on a
doubleword. Single-
bit errors are
corrected by hardware.
Malfunctioning
storage boxes can be
configured out of the
operational system.
Standard
Standard
G. 2361 Core storage Optional Cannot be attached
Up to 8 million bytes
can be attached.
H. High-speed buffer Not provided
storage
1. Cycle time
2. CPU-to-buffer fet~ch
time
8K is standard.
8K more can be added
80 nanoseconds
160 nanoseconds for
8 bytes; a request
can be initiated
every 80 ns cycle.
os - Model 65
All are supported.
Storage protection is
supported.
Hierarchy support is
provided.
OS - Model 165
All are supported.
Progran~ers can use the
hardware facility in
Assembler programs.
Same as Model 65