JOHN A BROWN
Electrician at Pampas Ricas Dr, Leander, TX
License number
Texas 151901
Expiration Date
Jun 23, 2017
Category
Apprentice Electrician
Address
Address
709 Pampas Ricas Dr, Leander, TX 78641
Phone
(512) 771-0357
Professional information
Multi-Board System Having Electronic Keying And Preventing Power To Improperly Connected Plug-In Board With Improperly Configured Diode Connections
US Patent:
5203004, Apr 13, 1993
Filed:
Jan 8, 1990
Appl. No.:
7/464817
Inventors:
William P. Bunton - New Braunfels TX
John M. Brown - Leander TX
Patricia L. Whiteside - Austin TX
John M. Brown - Leander TX
Patricia L. Whiteside - Austin TX
Assignee:
Tandem Computers Incorporated - Cupertino CA
International Classification:
G06F 126, G06F 1508
US Classification:
395800
Abstract:
A computer system with a number of subsystems or modules on separate circuit boards employs electronic keying to ensure proper configuration of these boards. A power key arrangement associated with a plug-in connector enables a separate power supply for each set of boards. A power supply turn-on signal is routed through a uniquely-configured connector path for each board, so the power supply turn-on is inhibited for improper configurations. The uniquely-configured connector path may use either a series or a parallel implementation. The series implementation employs a set of diodes connected for conduction in either of two directions, with the mating connector having its conductor paths connected to match the diode configuration; in this manner, the power supply enable signal can only flow through the series path if the proper board is plugged into a properly-coded slot, in which case the power supply to activate this board is activated through the series path including the diodes. The parallel implementation employs a given number of connector pins to establish the coding for each board, and each pin is either open-circuited or connected to ground; if this coding of the subsystem board is not the same as that of the slot into which it is plugged then the power supply activation signal will be shorted to ground by one or the other of the coded pins.
Module For Insertion Into A Multi-Module System Having Electronic Keying For Preventing Power To Improperly Connected Modules With Improperly Configured Diode Connections
US Patent:
5293636, Mar 8, 1994
Filed:
Dec 24, 1992
Appl. No.:
7/996728
Inventors:
William P. Bunton - New Braunfels TX
John M. Brown - Leander TX
Patricia L. Whiteside - Austin TX
John M. Brown - Leander TX
Patricia L. Whiteside - Austin TX
Assignee:
Tandem Computers Incorporated - Cupertino CA
International Classification:
G06F 126, G06F 1508
US Classification:
395800
Abstract:
A computer system with a number of subsystems or modules on separate circuit boards employs electronic keying to ensure proper configuration of these boards. A power key arrangement associated with a plug-in connector enables a separate power supply for each set of boards. A power supply turn-on signal is routed through a uniquely-configured connector path for each board, so the power supply turn-on is inhibited for improper configurations. The uniquely-configured connector path may use either a series or a parallel implementation. The series implementation employs a set of diodes connected for conduction in either of two directions, with the mating connector having its conductor paths connected to match the diode configuration; in this manner, the power supply enable signal can only flow through the series path if the proper board is plugged into a properly-coded slot, in which case the power supply to activate this board is activated through the series path including the diodes. The parallel implementation employs a given number of connector pins to establish the coding for each board, and each pin is either open-circuited or connected to ground; if this coding of the subsystem board is not the same as that of the slot into which it is plugged then the power supply activation signal will be shorted to ground by one or the other of the coded pins.