
CHR$ is a string function that generates strings from numeric values (a.k.a ASCII values). These string have always a length of 1, since an ASCII value represents exactly one character.
This little example prints the string "ABC" that is constructed from ASCII values
outmode -2 let a$ = chr$(65) + chr$(66) + chr$(67) print a$
Greater arguments than 255 are allowed, but all bits above bit 7 are truncated.
The inverse function of CHR$ is ASC. Please see also the ASC page.