[LeoPanthera]

I can't remember the name of the product but in the 80s there was a hardware spell checker for the IBM PC. It was a box that connected between your keyboard and your PC, and if you ever typed a string of letters that it did not recognize as a dictionary word, it would beep to let you know.

[jadamson]

Xerox PC Type Right

https://vintageapple.org/pcworld/pdf/PC_World_8711_November_... page 237 has a review (big PDF warning)

[eurleif]

>You can even set the device to recognize your password and beep if you mistype it, thereby eliminating a bevy of incorrect sign-on messages.

Wow, what a thing for a tech publication to suggest doing! Different times.