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Indirect Access from a Program Bank
This mode is similar to mode 0-1, except that the contents of the specified location determine
the actual location to use.
This mode is used to specify the location of the next part of the pro-
gram, when a shift to another program bank is desired.
Indirect Access from the Common Data Bank
This mode is similar to mode 3, except that the contents of the specified location determine the
actual location to use.
This mode is used for indirectly accessing constants and variables which
are common to parts of the program located in more than one program bank, and for returning
from subroutines.
Indirect Access from a Channel Table
This mode is similar to mode 3, except that the contents of the specified location determine the
actual location to use.
This mode is used to pick up and store words which contain part of a
message.
INTERRUPT INTERFACE
The Interrupt Interface feature of the DATANET-30 allows data transfer directly between memory
and peripheral equipment or another DATANET-30. The data is transferred by interrupting the
DATANET-30 one word-time for each data transfer.
One DATANET-30 word is transferred to
or from memory.
The buffer modules and peripheral equipment that use the interrupt interface
are as follows:
Option Module
1. Controller Selector Unit
(CSU931}
2. Common Peripheral Channel
(CPC930)
3. Processor Interrupt Unit
(PIU930)
4. Removable Disc Unit
(RDU930)
To
Disc Storage Unit
Magnetic Tape Unit
High Speed Printer
Disc Storage Unit
Magnetic Tape Unit
High Speed Printer
Card Reader
Card Punch
A DATANET-30
Removable
Disc Storage
Controller
Cycle No.
Assigned
1 and 3
x,x
x
x
x
x
2
x,x
The interrupt interface provides for memory interrupt cycles that are assigned to the option
modules listed above.
The interrupt interface provides groups of 5 memory cycles, numbered
1,2,3,4&5.
A certain numbered cycle can be individually assigned to an option module, and when
a memory cycle is needed to transfer data, the assigned cycle can be obtained without interference.
[ID/A\1J/A\~~1Jc=J ~®------------
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