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The DATANET-3101 system uses answer-back lines to acknowledge the transmission or provide
a signal indicating that an error has occurred.
THE CIU-930 COMPUTER INTERFACE UNIT
For those systems requiring a combination data communication-information processing system,
a CIU-930 Computer Interface Unit is provided.
This unit permits attaching a DATANET-30
data communication processor to a General Electric Compatibles/200 Information Processing
System.
With this combination, the DATANET-30 is responsible for the communications half
of the system, while the Compatibles/200 system is responsible for the data processing.
Twenty-one-bit words are transferred in parallel to and from the information processing system
via the Computer Interface Unit.
The memory address is also transferred in parallel from
the address register in the CIU.;.930 to the processing system prior to the data transfer.
The CIU allows addressing any location in the central processor memory. The CIU-930 connects
into any channel of the DATANET-30 buffer selector in the same manner as any other buffer.
The buffer selector address of the CIU-930 is specified by the wiring of the buffer selector
address plug for the module.
There is no DATANET-30 hardware restriction on the number
of CIU' s which may be used, other than the physical space occupied. On processing system
side. the CIU-930 can connect into any GE-215/225/235 priority control channel.
CIU-930
Address
Register
Busy
Not
Datanet-30
21
Data Register
21 Bits
Busy
Information
Processing
System
Figure I-3. Computer Interface Block Diagram
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I-5
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