Direct Printing of a CRT Display Image
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Printer adapter 10 captures video data 11 directly from a CRT display adapter, stores it as a multi-pel-wide column, then sends it to a thermal or other printer as a 90-degree rotated image. When the printer PRINT SWITCH is depressed, control logic 12 resets print-line counter 13, which keeps track of the current printer line. Counter decoder 14 controls the top and bottom margins and presets column-position counter 15. Counter 15 keeps track of which n-pel-wide column is about to be stored in the column buffer. Segment-displayed counter 16 keeps track of the current n-pel-wide segment of a horizontal CRT display line. Video data 11 is continuously shifted through n-bit shift register 17.