Abstract: A method and apparatus can detect errors within an incorrect media access control address and can prevent an Ethernet device from using the incorrect media access control address while it is fully operating. The method and apparatus can also correct some types of errors within the media access control address so that the Ethernet device may operate using a correct media access control address.

Abstract: A set of processes are disclosed for compressing and decompressing bitmapped picture files that are to be stored for later display within a control for an HVAC system. The compression process includes an examination of the first bitmapped pixel in a given bitmapped file followed by a counting of the number of consecutive pixels having the same state as the first pixel. The process continues with analyses of successive numbers of pixels of first one state and then another state and generating a numerical representations as to each number of so counted pixels until the last pixel of the bitmapped picture file data is analyzed. The resulting compressed file is stored in a memory within a control for an HVAC system so that the file can thereafter be read when the file is to be displayed.

Abstract: A load program causes a user's computer to generate an intermediate code as a function of a read time from the computer's system clock and an operating system ID. The software provider receives the intermediate code from the user and generates a password as a function of the intermediate code and a secret product ID code for the software that the user wishes to install. The load program within the user's computer uses the same mathematical algorithm to compute an internal key upon the next execution of the load program. The internal key is compared with the software supplier's password following a prompt from the load program to enter the supplier's password. The software supplier's password and the internally generated password must both agree before the load program authorizes execution of the software that the user wishes to install.

Abstract: A set of processes are disclosed for compressing and decompressing bitmapped picture files that are to be stored for later display within a control for an HVAC system. The compression process includes an examination of the first bitmapped pixel in a given bitmapped file followed by a counting of the number of consecutive pixels having the same state as the first pixel. The process continues with analyses of successive numbers of pixels of first one state and then another state and generating a numerical representations as to each number of so counted pixels until the last pixel of the bitmapped picture file data is analyzed. The resulting compressed file is stored in a memory within a control for an HVAC system so that the file can thereafter be read when the file is to be displayed.

Abstract: Cylinder engine data, is displayed in a bar chart graphics mode format on a cathode ray tube (CRT); the data from each cylinder is displayed in dual bar segments comprising a first bar representing the mean value and a second bar representing the mean deviation of the measured parameter data, the first bar extending from a zero baseline on the abscissa to the mean measured value as represented graphically by comparison to a scaled ordinate, the second bar being generally centered about the first bar mean value and extending at its end points to the actual peak and actual minimum values of the selected parameter.