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I mean they had laptops; just

for (unsigned char i = 0; i < 127; i++) { printf("%x: %c\n", i, i); }

Or `man ascii`

Surely `spaceman ascii`

$ spaceman ascii

bash: spaceman: command not found

chatgpt how to fix bash: spaceman: command not found

It’s a book. Explaining a lookup table is way easier for a reader than explaining this code snippet.