Apple II
Technical Notes
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                                                  Developer Technical Support


ImageWriter
#1:    Custom Font Selection

Revised by:    Matt Deatherage                                  November 1988
Written by:    Rilla Reynolds                                    October 1986

This Technical Note documents an ImageWriter II firmware bug which affects 
custom font selection.
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Due to an ImageWriter II firmware bug, the ESC ' command neither selects nor 
reselects custom font 1 after custom font 2 is selected, unless you fix an 
errant pointer with the following command sequence first:

    7-bit mode:    ESC  Z  00  20   ESC  D  00  20   ESC  '
    8-bit mode:    ESC  Z  00  20   ESC  '

The ESC ' command works correctly on an ImageWriter I, but the sequence above 
is also acceptable; therefore, it is in your best interest to always utilize 
the given sequence to select custom font 1.  It is possible that the printer 
was initialized and custom font 2 was selected long before your program was 
launched.

