Cable for transmitting eight-bit parallel data

• US 5,293,497 A
• Filed: 04/15/1993
• Issued: 03/08/1994
• Est. Priority Date: 03/13/1991
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Traveling Software, Incorporated
• Inventors: Free, Gordon G.
• Primary Examiner(s): Heckler, Thomas M.
• Application Number:
  US08/048,854
• Time in Patent Office: 327 Days
• Field of Search: 439/623, 364/DIG. 2, 395/200, 395/325
• US Class Current: 710/305
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 15/17 using an input/output type connection, e.g. channel, I/O port
• CPC Class Codes: G06F 2213/0004 Parallel ports, e.g. centronics

Abstract

Disclosed is a system of transmitting data from a sending computer (10) to a receiving computer (30) in an 8-bit parallel format. Each computer includes a parallel communications port (14 and 34) having a data output register (24 and 44), a status register (26 and 46) and a control register (28 and 48). The method includes the steps of connecting the computers, configuring the receiving computer and writing the data to be transmitted at the sending computer. The method further includes the step of determining whether the receiving computer has the ability to receive 8-bit parallel communication. A cable for providing a communication link between the two computers is also disclosed.

Claims

1. A cable for use in transmitting parallel data between a first computer and a second computer, wherein the first computer and the second computer are of the type that include a parallel communications port having a data output register, a status register and a control register, wherein the cable comprises:

a first connector that is connectable to the parallel communications port of the first computer,

a second connector that is connectable to the parallel communications port of the second computer,

a plurality of conductive leads disposed between the first and second connectors, wherein the plurality of conductive leads include;

a first set of leads that couple the data output register of the first computer to the status register of the second computer, wherein the first set of leads carry a first portion of the parallel data from the first computer to the second computer; and

a second set of leads that couple that control register of the first computer to the control register of the second computer, wherein the second set of leads carry a second portion of the parallel data from the first computer to the second computer.

2. The cable of claim 1, wherein the plurality of conductive leads further include an acknowledge line that couples the data output register of the first computer to the status register of the second computer.

3. The cable of claim 1, wherein the parallel data transmitted between the first and second computers is transmitted in 8-bit bytes and wherein the first portion of parallel data carried on the first set of leads is a 4-bit nibble of data and wherein the second portion of parallel data carried on the second set of leads is a 4-bit nibble of data.

4. The cable of claim 1, wherein the second set of leads are bidirectional such that data are transmitted from the control register of the second computer to the control register of the first computer and wherein the plurality of conductive leads further comprises:

a third set of leads that couple the data output register on the second computer to the status register of the first computer, wherein the third set of leads carry parallel data from the second computer to the first computer.