Word processor

A word processor comprising:

• an input keyboard;
• a memory for storing word data input from the keyboard;
• a display unit for displaying one line of data from the memory;
• a printer for printing the line of data;
• a display buffer for storing the line of data for display by the display unit;
• a print buffer for storing the line of data for printing by the printer;
• and
• control means for decoding data transmitted from the memory to the display buffer and causing the line of data to be transmitted from the memory to the print buffer for printing in response to a predetermined data code;
• the control means comprising a current address register for storing a current address in the memory, a starting address register for storing a starting address of the line of data in the memory, cursor address register for storing a cursor address of the line of data in the memory, comparator means for sensing coincidence between contents of the current address register and the cursor address register and incrementation means for incrementing the current address register, the control means further comprising means to transfer data from the memory to the display buffer and print buffer by setting contents of the starting address register into the current address register, incrementing the current address register while transferring data and terminating transfer of data when the contents of the current address register and cursor address register coincide.

A word processor comprising:

• an input keyboard;
• a memory for storing word data input from the keyboard;
• a display unit for displaying one line of data from the memory;
• a printer for printing the line of data;
• a display buffer for storing the line of data for display by the display unit;
• a print buffer for storing the line of data for printing by the printer;
• and
• control means for decoding data transmitted from the memory to the display buffer and causing the line of data to be transmitted from the memory to the print buffer for printing in response to a predetermined data code;
• the control means further comprising an address pointer register for storing a current address in the display buffer, a left margin address register for storing a left margin address in the display buffer and a line tail address register for storing a line tail address in the display buffer corresponding to a current address at which a previous line feed operation was effected, the control means further comprising means for selectively setting contents of the left margin address register and the line tail address register into the address pointer register prior to transfer of data from the memory into the display buffer.

A word processor comprising:

• an input keyboard;
• a memory for storing word data input from the keyboard;
• a display unit for displaying one line of data from the memory;
• a printer for printing the line of data;
• a display buffer for storing the line of data for display by the display unit;
• a print buffer for storing the line of data for printing by the printer;
• and
• control means for decoding data transmitted from the memory to the display buffer and causing the line of data to be transmitted from the memory to the print buffer for printing in response to a predetermined data code;
• the display unit being constructed to display control codes including a backspace code.