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SECTION 2A.
M2-I CORE STORAGE SUPPLEMENT
COMPREHENSIVE INTRODUCTION
•
The M2-I storage unit is the 1.5 microsecond read-write
storage unit for the IBM 2030.
•
The M2-I is a separately packaged core storage unit in
the 2030.
•
A memory/CPU interface transfers all information between
the M2-I and the 2030.
The M2-I memory provides the IBM 2030 Proc-
essing Unit with a 1.5 microsecond read-
write cycle time.
The basic unit of infor-
mation in the 2030 is the eight-bit byte,
with an additional bit added to maintain
odd parity of data.
Storage sizes are the
same as for the 2.0 microsecond M2 memory
offered on early 2030's.
The 8K, 16K, 32K,
and 65K refer to 8,192 bytes, 16,384 bytes,
32,768 bytes, and 65,536 bytes of storage,
respectively.
Like the M2 memory, the M2-I is a sepa-
rately packaged unit that is installed in-
side the 2030 Processing Unit.
This sepa-
rately packaged unit contains the controls,
timing generator, core
arr~y,
drive system,
and sense/inhibit system.
An M2-I may be
8K, 16K, or 32K in size (Figure 2-64).
If
the 2030 requires the full 65K of storage,
two separate M2-I units are installed in
the 2030.
Timing
and
Interface
Array
Gates
and
Heater
Area
Sense Amps
and Z Drivers
R
E
S
I
S
T
o
R~
S
X,
Y Drive
Resistors
Figure 2-64.
M2-I Storage Unit (8K, 16K,
32K)
2-65
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