millfork/docs/stdlib/stdio.md

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stdio

The stdio module automatically imports the string and err modules.
It requires an implementation of void putchar(byte a) and therefore works only on targets with console output.

void putstr(pointer str, byte len)

Prints a string of length len located at address str.

void putstrz(pointer str)

Prints a null-terminated string located at address str.
If the string is longer than 255 bytes, then the behaviour is undefined (might even crash).

void putword(word w)

Prints the decimal representation of the 16-bit unsigned integer w.

void ensure_mixedcase()

On targets that have separate all-caps and mixed-case modes (like most Commodore machines), switches to the mixed-case mode.