Look up ASCII chart 64 https://en.wikipedia.org/wiki/The committee decided it was important to support uppercase 64-character alphabets, and chose to pattern ASCII so it could be reduced easily to a usable 64-character set of graphic codes,[3]:228, 237 §14 as was done in the DEC SIXBIT code (1963).
Lowercase letters were therefore not interleaved with Probably the most influential single device on the interpretation of these characters was the Teletype Model 33 ASR, which was a printing terminal with an available paper tape reader/punch option.
the Teletype Model 33 machine assignments for codes 17 (Control-Q, DC1, also known as XON),
One observation - there are never more than 2 locks next to each other.
Yes, which means the locks represent a binary option, either one lock or two locks. So what does one lock or two locks represent?
If we consider only the locks, where 1 lock means "0" and 2 locks means "1," we get the following string:
01000000100010100001001000000010
This appears to be gibberish, but it's worth noting that the string is 32 characters long.
If you break that into bytes you get ["01000000", "10001010", "00010010", "00000010"] which yields [64, 138, 18, 2]. Each byte has 8 bits
Look up ASCII chart 64 https://en.wikipedia.org/wiki/The committee decided it was important to support uppercase 64-character alphabets, and chose to pattern ASCII so it could be reduced easily to a usable 64-character set of graphic codes,[3]:228, 237 §14 as was done in the DEC SIXBIT code (1963).
Lowercase letters were therefore not interleaved with Probably the most influential single device on the interpretation of these characters was the Teletype Model 33 ASR, which was a printing terminal with an available paper tape reader/punch option.
the Teletype Model 33 machine assignments for codes 17 (Control-Q, DC1, also known as XON),
Sorry for format copy and paste issues