Function pir_8_emu::binutils::pir_8_emu::display::status::read_gp_register_letters

pub fn read_gp_register_letters(
    x_start: usize, 
    y_start: usize
) -> Option<[char; 8]>

Read General-purpose register letters at the status line

The prompt will appear in the value space, and the value will be set to new register letters, if the input was cancelled, it'll be {cancelled}, and if the labels weren't valid, {<error message>}