Rdc 930 Removable Disc Storage Subsystem; Removable Disc Unit Module (Rdu 930); Controls And Indicators - GE DATANET-30 System Manual

RDC 930 REMOVABLE DISC STORAGE SUBSYSTEM
The RDC 930 Removable Disc Subsystem provides the DATANET-30 with a low-cost, removable
media, random access storage unit packaged in modular free-standing cabinets. The disc control
unit contains two disc mechanisms. Additional storage units may be added for a maximum of six
disc mechanisms per system.
Communication with the DATANET-30 is provided by the Removable Disc Unit Module RDU 930
mounted in the DATANET-30 option module rack. One module space is required for the RDU 930.
The RDU 930 interfaces with the buffer selector and interrupt interface of the DATANET-30.
The buffer selector address is specified by the buffer selector address plug for the RDU 930. The
block diagram, Figure 27 illustrates a complete DSU-100 Subsystem.
DATANET-30
Memory
I
RDU 930 Module
Buffer
Selector
-
ASU
930
Disc
Control
Unit
RDC 930
Figure 27. DATANET-30/RDC 930 Block Diagram
Removable Disc Unit Module (RDU 930)
ASU 930
The RDU 930 provides the necessary control functions to transfer data to or from memory, and
to issue commands to the disc control unit. The interrupt interface allows the transfer of an
18-bit DATANET-30 word to or from memory on a memory interrupt basis.
The memory address counter directs the flow of data. Up to 16,384 consecutive memory locations
may be addressed. The address counter is counted up one, each time a word is transferred to or
from memory. Command word sequencing control directs the RDU and the disc control unit.
Controls and Indicators
Except for manual reset on the DATANET-30 control panel, all controls and indicators for the
RDU 930 are by program only. The controls and indicators for the RDC 930 are located on the
disc control unit.
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