James J Raymond

US Patent:

44059795, Sep 20, 1983

Filed:

Oct 6, 1980

Appl. No.:

6/194495

Inventors:

Thomas O. Holtey - Newton MA
Steven S. Noyes - Boylston MA
James C. Raymond - Framingham MA

Assignee:

Honeywell Information Systems Inc. - Waltham MA

International Classification:

G06F 304

US Classification:

364200

Abstract:

A data processing system having a communications subsystem operating in a byte control protocol mode includes apparatus for establishing byte synchronization between the data circuit terminating equipment (DCE) and the communications subsystem. The apparatus includes a flop for receiving a stream of predetermined binary bits, a counter generating count signals indicative of the number of binary bits between a byte timing signal from the DCE and the last binary ONE bit of the last byte containing all binary ONE bits, a shift register for the serial shifting of the transmitted data bits and a multiplexer responsive to the count signals for selecting the shift register terminal, thereby timing the byte timing signal to the binary bit stream of data bits, including bytes of all binary ONE bits and a byte of all binary ZERO bits, followed by bytes of data bits.

US Patent:

43793401, Apr 5, 1983

Filed:

Oct 6, 1980

Appl. No.:

6/194698

Inventors:

Thomas O. Holtey - Newton MA
Richard P. Kelly - Nashua NH
Steven S. Noyes - Framingham MA
James C. Raymond - Framingham MA

Assignee:

Honeywell Information Systems Inc. - Waltham MA

International Classification:

G06F 304

US Classification:

364900

Abstract:

A data processing system includes a communications subsystem communicating with a number of devices. A counter monitors the communication line to detect when a communication line goes idle, that is at least 15 successive binary ONE bits appear on the line for the bit oriented protocol mode. The counter advances on successive binary ONE bits and is forced to a hexadecimal ZERO in response to a binary ZERO. If the counter reaches a count of hexadecimal F (decimal 15) a carry signal from the counter prevents the counter from advancing and initiates an idle link state.

US Patent:

44183844, Nov 29, 1983

Filed:

Oct 6, 1980

Appl. No.:

6/194655

Inventors:

Thomas O. Holtey - Newton MA
Richard P. Kelly - Nashua NH
Steven S. Noyes - Boylston MA
James C. Raymond - Framingham MA

Assignee:

Honeywell Information Systems Inc. - Waltham MA

International Classification:

G06F 300
G06F 1106

US Classification:

364200

Abstract:

A data processing system operating in a bit oriented protocol (BOP) mode of operation senses a transmit underrun; that is, the subsystem is not receiving data from a microprocessor fast enough to maintain the synchronous transmission over the communication line. Apparatus senses the transmit underrun state and generates an abort sequence of bits containing from 8 to 13 successive binary ONE bits.