there is plenty of information available in books and magazines on the seven-pin vertical print head that applies to the Commodore graphic mode on your MPS 1000 printer. Bit Image Coding A bit image is a character programmed onto the 7 X 16 grid that corresponds to the print head of your printer. When the dots are pro- grammed (placed where you want them on the grid), it is printed out by the print head when the pins at the locations you have programmed strike to create dots to form an image. By using CHR$(8), you enter the Bit Image graphic printing mode. This allows you to design and print bit image graphics by inputting bit image data.
Each DATA statement is made up of numbers that repre- sent a row of dots which, when READ together, make up your bit graphic image. To design a bit image graphic, follow the steps outlined in the example below. 1) Use a separate piece of paper to design your bit image graphic. 2) Make a dot grid like this, with 7 vertical rows and 16 horizontal columns. The numbering of the vertical rows is extremely important.
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 64 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3) Now fill in the dots you want to print to form a bit image, as in the following. 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 8 • 0 0 0 0 0 0 16 0 0 32 0 0 0 0 0 0 0 0 0 0 64 oo OO OO OOOO 4) Now add together numbers for each column for the rows in which a dot appears. For instance, there are two dots in the first column, one 75