PETER G MARSHALL
Broker in Hassanamisco Indian Reservat, MA
License number
Massachusetts 9001646
Issued Date
Feb 19, 1993
Expiration Date
Dec 15, 1997
Type
Salesperson
Address
Address
Hassanamisco Indian Reservat, MA 01519
Professional information
System For Controlling Access To Computer Bus Having Address Phase And Data Phase By Prolonging The Generation Of Request Signal
US Patent:
4908749, Mar 13, 1990
Filed:
Nov 15, 1985
Appl. No.:
6/798595
Inventors:
Peter G. Marshall - Grafton MA
Robert Feldstein - Grafton MA
Robert Feldstein - Grafton MA
Assignee:
Data General Corporation - Westboro MA
International Classification:
G06F 1342, G06F 1338, G06F 1318
US Classification:
364200
Abstract:
A computing system is disclosed which uses a system busy signal on its system bus to help control access to said bus. One or more requesters can generate a request signal when the system busy signal is not asserted. System busy is asserted along with the request signal(s) and remains asserted until all requesters which generated a request signal have gained access to the bus in order of priority. A freeze signal is generated on the system bus during the address phase of an instruction and a wait signal is generated during each data transfer in the data phase of an instruction. The freeze signal may be generated by a memory control unit, a memory module or a requester.
Electronic Board Identification
US Patent:
4675769, Jun 23, 1987
Filed:
Nov 15, 1985
Appl. No.:
6/798735
Inventors:
Peter G. Marshall - Grafton MA
Ulrich B. Goerke - Westboro MA
Ulrich B. Goerke - Westboro MA
Assignee:
Data General Corporation - Westboro MA
International Classification:
H02H 300
US Classification:
361 1
Abstract:
The invention electronically identifies whether a computer module board is placed in the correct mechanical slot in a computer frame. A conductive line is connected to at least one electronic connector location in each mechanical slot in a computer frame. A computer module has open circuit electrical connectors which if put in the correct slot will mate with the locations in the slot in the frame which are connected to the conductive line. The other electrical connections which are used for identification are connected to a ground plane in the computer module board. A voltage source is connected through a resistor to a conductive line in the computer frame producing a high signal. If any computer module board engaged in a slot of the computer frame is in the incorrect slot, a low signal will be caused indicating the fault. The fault signal will be supplied to a power supply controller which prevents operating power from being provided to the computer boards.