Browse Prior Art Database

Controller Attachment to Space and Time Separated Displays

IP.com Disclosure Number: IPCOM000084516D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Foglia, HR: AUTHOR [+2]

Abstract

Due to storage and resource sharing considerations, connections between controller and display stations in existing multidisplay facilities have evolved into highly parallel configurations, even though the signaling processes between the controller and the individual displays may be discretely separated in time. This type of arrangement is shown in Fig. 1.

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Controller Attachment to Space and Time Separated Displays

Due to storage and resource sharing considerations, connections between controller and display stations in existing multidisplay facilities have evolved into highly parallel configurations, even though the signaling processes between the controller and the individual displays may be discretely separated in time. This type of arrangement is shown in Fig. 1.

For economical reasons, and/or to simplify expansion of existing facilities, it is obviously desirable to replace these connections by a single multiaccessible coaxial cable, as suggested in Fig. 2.

Adaptation of the controller to couple to the single cable can be accomplished simply. The output lines of the controller, which normally extend directly to the display stations, are connected instead to adaptor circuits shown in Fig. 3. The time separated output signal are merged via OR circuit 3-1 and used to activate holdover single-shot circuit 3-2 which, in turn, conditions selective tone generator circuit 3-3. The latter circuit receives the individual controller outputs and produces unique frequency tones, which represent respective line (and display station) addresses. High-pass filter circuit 3-4 passes the selected tone, via the driver section of receiver/driver circuits 3-5, to the external interface.

At the same time display and data signals emitted from the controller are passed, via OR 3-1, delay 3-6 and low-pass filter 3-7, to the driver section of circuit 3-5; preceded or accompanied (because of the delay) by the tone signal produced by circuit 3-3. Signals to be sent to the display stations from the driver section of circuit 3-5 can be either directly coupled to the high-isolation tap of the multidrop coaxial cable (e.g., for baseband signaling) or utilized as modulation arguments for modem apparatus 3-8 arranged between circuit 3-5 and...