@!!  test page ! !  
Test the printer is working properly 
1, font detection: 
 Comparison of times, times width, quadruple-size characters and general compliance with the height and width font multiple relationships, if they meet the applicable printer. 

Common effects: Normal 
Double higher effect: !!Double height! !  
Double wider effect: !!Double width ! !  
Quadruple-size effect: !! quadruple-size ! !  

2, a small ticket paper width detection 
 Compare the following lines of print characters per line if the horizontal line, and there is no extra space, compared to the number of lines of characters in the printer.
32 characters: 
-------------------------------- 
33 characters: 
--------------------------------- 
42 characters: 
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48 characters: 
------------------------------------------------ 
64 characters: 
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