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Memory Interrupt Cycle Assignment
The RDC 930 is assigned two out of five nonadjacent memory cycles. Selection of the memory
cycles is determined by what other equipment in the system also uses interrupt cycles. When
determined, switches on the RDU 930 are set to assign cycles to the removable disc system.
Two disc control units (RDC 930) can be connected to a DATANET-30 if different memory cycles
are assigned.
The number of disc control units that can be connected to the DATANET-30 is
limited by the memory cycles available.
A different buffer selector address would be used to
address each RDC 930.
The disc control unit contains the necessary logic and circuits to control the read/write head
positioning, data transfer, and associated functions of the removable discs located in the control
unit, as well as provide some control functions for each additional storage unit (ASU 930).
Additional Storage Unit (ASU 930)
The additional storage unit (ASU 930) provides two additional disc handlers for added storage
capacity.
This unit is an additional cabinet with electronics and two disc drivers.
It
is connected
to and is under control of the RDC 930. Two ASU 930 units may be connected to each RDC 930
providing a maximum of six disc drive mechanisms per disc control unit.
Extra Removable Disc Cartridge (ASD 930)
Extra removable discs may be kept available in the same manner as magnetic tape reels, thus
providing a removable storage media.
CARD READER UNIT
One card reader unit (CRU 930) connects the CRF 930 card reader to the DATANET-30. The
card reader unit occupies one option module space and is assigned an address on the buffer
selector. The buffer selector address is specified by the address plug for the CRU.
DATANET-30
Control
--
--
CRU 930
--
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Data and Status
Figure 28. DATANET-30 with a Card Reader
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