Stewart Bryant writes:
However these are not taken as normative, so you have to
produce an ASCII equivalent, which fundamentally limits the
complexity of any normative diagram.
Depends. If the ASCII document is large enough, in theory you can
represent any monochrome image with an arbitrary degree of accuracy.
If line lengths or number are limited, though, this isn't possible.
Essentially you just make some non-blank ASCII character represent a
dark pixel, and use a blank for a white pixel. So with 768 lines of
1024 characters each, you can represent a typical video display.
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