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SECTION I.
INTRODUCTION
converts each character into the code used by the intended recipient; thus, for example, the
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card reader control converts a character from Hollerith code to the internal six-bit code of the
central processor.
Finally, as each character is transferred, it is checked for accuracy by
the c ontr 01.
One particularly significant feature of the peripheral control is that it operates inde-
pendently of the central processor and requires access to the main memory only when infor-
mation transfers are performed.
In particular, all of the previously mentioned activities of
the control -
temporarily storing, converting, and checking the information -
do not involve
the central processor in any way.
When each character of information is transferred, one
main memory cycle is allocated for the transfer.
The Model 120 contains two integrated (i. e., "built in") peripheral controls.
The inte-
grated printer control directs the operation of a Type 122 Printer, while the integrated card
control can handle a Type 214-2 Card Reader/Punch (or a Type 123 Card Reader and a Type
214-1 Card Punch).
When the Type 103 Magnetic Tape Control is included, up to four Type
204B-111-12 Magnetic Tape Units can be attached to the Model 120.
If
the Model 120 is equipped with the Series 200 Control Unit Adapter (Feature 1015 or
1016), additional Series 200 peripheral devices may be employed by the system.
These devices
can be interconnected in many combinations to form a balanced system which meets the require-
ments of practically any computer application.
1-3
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