| 摘要 |
PURPOSE:To realize a bold printing easily by adding a simple circuit without providing a special circuit or mechanism, by making a part of bit forming a character have the mechanism detecting whether the bold printing exists or not. CONSTITUTION:When a printing data PRTDET is transferred from CPU, etc., it is stored in the buffer memory, etc. once, it is output in order through the data buses 10-12, and an alphanumeric code is input to the character discriminating circuit 1. This code is decoded by this circuit 1, and logic 1 is output to the A/N character line, the space line and the line corresponding to other character. And in case of bold printing, the sequential circuit of the 1 character printing control circuit 3 is operated by a data of the bolt bit line 12, and a strobe signal is output. In this way, the AND gate 7 is closed, the AND gate 6 is opened, the code such as an A/N character or a symbol, etc. through the data bus 10 from the buffer memory, etc. is made a data, and it is input to the printer interface circuit 4. |
