I recently bought a Logitech G915 TKL Keyboard. https://www.logitech.com/assets/65840/g915-lightspeed-wireless-rgb-mechanical-gaming-keyboard-qsg.pdf
It's great but a massive disadvantage is that typing in the dark is made difficult because the shift characters at the bottom of the keys aren't illuminated - only the non-shifted.
It got me wondering about the history of illuminated keyboards and how they have developed. What were the earliest ones like and did they have illuminated shift characters?