Yes. It is common for files to use different schemes for different types of data.
ASCII patterns do not correspond to a printable character.
For example, the pattern 0x00
(ie. 0000 0000)
is the NUL character.
NUL is often used as a marker in collections of data.
The pattern 0x0A is the linefeed character (LF),
sent to a printer to indicate that it should
advance one line.
The patterns 0x00 through 0x1F are called control characters
and are used to control input and output devices.
The exact use of a control character depends on the
particular output device.
Many control characters were originally used
to control the mechanical functions
of a Teletype machine.
Could a computer terminal be a mechanical device???