In Feburary 2016 27,
Immediate addressing mode means that the value for a given instruction in assembly programming is directly specified. This means the value is constant and written immediately and immutably into the instruction.
Common Format of Immediate Addressing
The following is an example of the format typically found with immediate addressing mode: Operator Target, ValueIn the example format, the value of the number Value is operated on the value stored in Target. Value is a constant value, which does not change no matter what occurs in the set of assembly instructions.
Direct Addressing Mode
Direct addressing mode means that the value for a given instruction in assembly programming is pointed to by a given value. This means the value is variable, based on what is stored in memory at a given address.
Common Format of Direct Addressing
The following is an example of the format typically found with direct addressing mode: Operator Target, (Address)In the example format, the value at the memory location of Address is a variable value in memory, which can be written to and read from during the course of a program. The location in memory is directly specified with a number, which will never change over the course of instruction execution.
More Modes
There are many more addressing modes available, depending on the assembly language being used. These modes include Scaled, Deferred, Memory Deferred, Auto Increment and a variety of other types.
In Feburary 2016 27,
Showing posts with label occurs. Show all posts
Showing posts with label occurs. Show all posts
Saturday, 27 February 2016
Friday, 26 February 2016
'Disconnected From Server' in FileZillaIn Feburary 2016 26,
In Feburary 2016 26,
FileZilla can implement most of the variations of FTP, which is one of the oldest applications on the Internet. FTP's original version had few security features. To compensate for this, FTP over SSL/TLS, called FTPS and SSH FTP, called SFTP were developed. SSL is the Secure Socket Layer, which was later replaced by Transport Layer Security. These are the security features behind the HTTP Secure protocol, used by eCommerce websites to enable shoppers to enter their credit card details securely. The same security system was added to FTP to create FTP Secure. SSH is the Secure Shell that is a secure terminal emulator. SSH has its own file transfer protocol, known as Secure FTP. FileZilla is also able to transfer files according to these protocols.
Error Characteristics
The error occurs when uploading files from a PC to a server. The application completes 85 to 90 percent of the file delivery, then displays the message: “Error: Disconnected from server: ECONNABORTED - Connection aborted.” Afterward the transfer resumes, starting at 40 percent. It may again abort at the 85 to 90 percent mark and slip back to 40 percent transferred, or may complete the second time. On other occasions, the disconnected message appears in the log file, even though the file transfer continues and completes.
Cause
FTP uses two connections, one to send commands back and forth and the other for the transfer of data. FileZilla also maintains a separate connection to display the remote file directory in its own browser window. When a file is being transferred, the user often stops using the browser connection and it times out. The reported disconnect is for the browser connection, but the file transfer connections stay open because regular “keep alive” messages pass back and forth, preventing the server from closing them. The recurring transfer break at 85 percent is caused by an intermediate firewall or router dropping the control connection, which FileZilla then re-establishes.
Solution
FileZilla reports disconnection in its log file, but does not identify which connection was dropped or why. If the transfer proceeds and completes, there is little to worry about; this is a misreported or imprecise warning. Genuine dropped connections are usually caused by firewalls. You should specify FileZilla as an exception to force your firewall to accept the application's traffic. Where errors are caused by intermediate routers, there is little you can do to avoid the problem, because the router is not within your control. FileZilla, however, does work with proxy servers, so you can channel connections through a proxy to help the network server avoid a consistently troublesome router.
In Feburary 2016 26,
FileZilla can implement most of the variations of FTP, which is one of the oldest applications on the Internet. FTP's original version had few security features. To compensate for this, FTP over SSL/TLS, called FTPS and SSH FTP, called SFTP were developed. SSL is the Secure Socket Layer, which was later replaced by Transport Layer Security. These are the security features behind the HTTP Secure protocol, used by eCommerce websites to enable shoppers to enter their credit card details securely. The same security system was added to FTP to create FTP Secure. SSH is the Secure Shell that is a secure terminal emulator. SSH has its own file transfer protocol, known as Secure FTP. FileZilla is also able to transfer files according to these protocols.
Error Characteristics
The error occurs when uploading files from a PC to a server. The application completes 85 to 90 percent of the file delivery, then displays the message: “Error: Disconnected from server: ECONNABORTED - Connection aborted.” Afterward the transfer resumes, starting at 40 percent. It may again abort at the 85 to 90 percent mark and slip back to 40 percent transferred, or may complete the second time. On other occasions, the disconnected message appears in the log file, even though the file transfer continues and completes.
Cause
FTP uses two connections, one to send commands back and forth and the other for the transfer of data. FileZilla also maintains a separate connection to display the remote file directory in its own browser window. When a file is being transferred, the user often stops using the browser connection and it times out. The reported disconnect is for the browser connection, but the file transfer connections stay open because regular “keep alive” messages pass back and forth, preventing the server from closing them. The recurring transfer break at 85 percent is caused by an intermediate firewall or router dropping the control connection, which FileZilla then re-establishes.
Solution
FileZilla reports disconnection in its log file, but does not identify which connection was dropped or why. If the transfer proceeds and completes, there is little to worry about; this is a misreported or imprecise warning. Genuine dropped connections are usually caused by firewalls. You should specify FileZilla as an exception to force your firewall to accept the application's traffic. Where errors are caused by intermediate routers, there is little you can do to avoid the problem, because the router is not within your control. FileZilla, however, does work with proxy servers, so you can channel connections through a proxy to help the network server avoid a consistently troublesome router.
In Feburary 2016 26,
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