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DS990 Hardware
The DS990 hardware supports the features of the
DXIO operating system. All DS990 systems are built
around the Model 990/10 Minicomputer with a
minimum of 128K bytes of error-checking-and-
correcting (ECC) memory. The 128K-byte processor
supports the OX 10 operating system in a dual-disk
drive system with one or more Model 911 Video
Display Terminals (VDTs). The versatility of the 990
processor input/output (I/O) structure is extremely
well-suited to the custom computer-system concept of
the DS990 system. Figure II shows the standard and
optional DS990 hardware connected to the TILINE
bus and communications-register-unit (CRU)
interface of the 990 processor. The high-speed,
bidirectional TILINE bus interfaces the processor
with memory and high-speed peripherals. The
standard disk drives (Model OSlO, Model DS25,
and Model DS50 Disk Systems) hold a complete
copy of the DXIO operating system, selected
application programs, and related data bases. An
optional disk drive on the TILINE (Model DS31
Disk System) and floppy-disk drive on the CRU
(Model FD800 Floppy-Disk System) allow the user
to partition the application software or data base to
990 Processor
The coordinated 990 family of computers offers the
prospective user a variety of choices that ranges
from the TMS 9900 microprocessor to the DS990
integrated hardware/software systems. The common
architecture and upward-compatible instruction set
permits programs to
be
transported from smaller
members of the family to the Model 990/10
Minicomputer.
Features of the 990/10 minicomputer, as supplied
with a DS990 system, include:
• Advanced memory-to-memory architecture with
programmable workspaces for fast, efficient
processing of multiple interactive tasks
• Large, versatile instruction set with 16-bit-word-
oriented and 8-bit-byte-oriented instructions and
with hardware multiply and divide
• Sixteen vectored interrupt levels
• TILINE, parallel, asynchronous bus for high-speed
communication among the central processor unit
(CPU), memory, and I/O controllers
37
fit the requirements of a particular business. The
optional Model 979A Magnetic-Tape Transport
allows the user to maintain application data on nine-
track, IBM-compatible magnetic tape.
While the TILINE bus can transfer large blocks of
data with one command from the 990 processor
j
the
CRU interface handles data ranging in size from a
single bit up to a word with one command. The
standard and optional 911 VOTs and the optional
data terminals on the CRU (Model 733 ASR and
Model 743 KSR Data Terminals) are the operator's
interactive interface with the OXIO operating system.
The optional printers (Model 810 Printer and Model
2230 and Model 2260 Line Printers) and the Model
804 Card Reader provide the user with a complete
selection of I/O media for the DS990 system. The
optional interface modules provide a facility for
controlling and monitoring special-purpose equipment
that may
be
connected to custom DS990 systems.
The optional I/O expansion chassis, shown in
figure II, extends the 990 main chassis in the larger
DS990 systems to accommodate additionally selected
options.
• Direct access up to 64K 8-bit memory bytes
• Program-controlled hardware mapping for
memory-addressing capability up to 2048K bytes
with isolation between mUltiple tasks
• Extended operation (XOP) codes for hardware or
software implementation of special functions
• Privileged-mode instructions that protect the
operating system from errant application programs
• Line-synchronized, real-time clock input
• Command-driven CR U for medium- and low-
speed bit, byte, and word I/O operations
• Permanent read-only-memory (ROM) loader
• Thirteen-slot chassis that provides mounting space,
coolIng air, dc power, and signal interconnections
for 990 CPU boards, memory boards, peripheral-
device controllers, and other full-sized or half-slot
990 interface boards. The chassis includes a
programmer panel for operator interface with the
990 CPU via a firmware utility program.
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