PC-NTDS 8-BIT

The adapter board can be programmed to emulate an NTDS peripheral or a host. It can be set up to operate either as an 8-, 16- or 32-bit parallel interface. It can be used to develop, test, and simulate Navy tactical software. The computer can be programmed to inject test, stimuli or collect data during execution of tactical software under test. 

The adapter provides the ca­pability to stimulate another tactical computer, a peripheral, or an entire combat system. The adapter has its own interface control lan­guage and includes assembly source code for NTDS drivers to allow the user to write custom Software. 

 For further information, contact: Sabtech Industries, 4091East La Palma Avenue, Unit P, Anaheim, California 92807. (714) 630-9335.

SIGNAL JULY, 1986

PC-NTDS interface

TACTICAL COMPUTER 
INTERFACE ADAPTER

A powerful interface adapter has been developed that will allow an ordinary IBM PC or AT computer or compatible to link up to the U.S. Navy Tactical Data Systems (NTDS-MIL-STD-1397) bus. The PC‑NTDS adapter card is a full 32-bit parallel interface board. It can be used with the AN/UYK-43, AN/UYK-7, AN/UYK-44, AN/UYK­20 and AN/UYK-14 tactical com­puters. Programmable interface protocol allows the emulation of any tactical interface. 

The PC-NTDS adapter card has been developed to allow users to replace costly military computers with lower cost and more easily used personal computers. 

Called a 32-bit bridge, the board provides full-duplex 32-bit I/O support for parallel communications with 32-bit tactical computers carrying the standard Navy AN/UYK designation. 'The board converts the communications protocol of the IBM PC into the protocol of the militarized computer," says Sabtech president Rahim Sabadia. The adapter costs $2,850 for the AT version or $1,600 for the XT-compatible unit. This contrasts favorably with standard military computers, notes Sabadia - they carry tabs of up to $500,000 each. 

   The product conforms to MIL-STD-1397, which governs NTDS hardware. "The adapter can be set up to operate as an 8-, 16, or full 32-bit parallel interface and can exceed the transfer rates that are required for the NTDS bus,” says Sabadia. The, NTDS has transfers a maximum of 250,000 words/s, each 32-bits wide. Sabtech’s board will transfer 3.3 MB/s or about 825,000 such words/s.
    The board also carries an RS-422 communications port with outputs that can be set for three-state operation and transmission at 19.2 KB/s. This allows the desktop computer to emulate tactical RS-422 based peripherals. 
    The PC/ XT interface card confirms to MIL-STD-1397A the slower version of the NTDS bus, with optional support for the faster MIL-STD-1397B. The AT-compatible the faster compatible interface supports both standards. Both units perform all types, of NTDS transfers – input, output, external function, and external interrupt. 
   SIMULATION: With the interface installed, a PC can be programmed to simulate an NTDS host computer Two interface boards can be installed in single PC to simulate a peripheral device with one board acting as output channel and the other as an input channel receiving data from a host.
    And because desktop based development systems do not require temperature controlled rooms, Sabadia Points out, the interface card can be installed in a portable machine such as a Compaq and be carried aboard ships for use as a software-debugging aid.
     The Test Message Generator software package provided with each adapter provides a high-level language for controlling the interface. Assembly-language source code for the I/O drivers is included, enabling users to write custom software, as well as diagnostic software and loop back-test cables.
    The adapter can also serve as a transparent RS-422-bus analyzer or monitor. The PC can be programmed to inject test stimuli or collect data during execution of tactical software. -Ellis Aguilar 

PC/NTDS INTERFACE
Is a PC/tactical computer adapter

32-Bit MIL-STD Interface Adapter

A MIL-STD-1397 interface adapter emulates militarized computers using desktop IBM PC/XT/AT or compatibles. Keystrokes, returns and communications protocol of tactical hardware (AN/UYK-7, AN/UYK-43, etc.) are simulated . PC-NTDS board is software programmable as 8-, 16- or 32-bit parallel interface. Data transfer rate, of up to to 3.3 Mbytes/s with switch selection of up to eight speed options (from 280 ns to 35.4 ms) are available. System has on‑board RS.422 port with tri-statable outputs and baud rate of 19.2K.

Sabtech Industries, Anaheim, CA (714) 630-9335.

The powerful PC-NTDS Adapter card can he used to emulate expensive tactical Navy hardware, allowing an IBM-PC AT or compatible such us a Compaq, to link up to the special Navy Tactical Data System (NTDS-MIL-STD-1397) bus. It can be used with AN/UYK-43, -7, -44, -2 and -14 tactical computers. Its programmable interface protocol allows the emulation of any tactical interface. Switch-selectable NTDS

Type A (slow) or B (fast) modes allow direct connection to corresponding NTDS channels on tactical computers. The adapter board can be programmed to emulate an NTDS peripheral or host, and can be set up to operate as either an 8-, 16-, or full 32‑bit parallel interface, An adapter Installed in an I BM-AT utilizes the full 16-bit data path of the AT and can output data at up to 3.3Mbytes/s. Single‑unit prices are $1600 for the Model PC‑NTDS for IBM-PC/XT/ATs and $2850 for the Model AT-NTDS for the IBM-AT. Contact Rahim Sabadia, Sabtech Industries, P.O. Box 1132, Yorba Linda, CA 92686, (714) 630-9335.