One silicon chip I did complete the reverse engineering of was the Mullard SAA5050 TROM Teletext chip, as used in the BBC Micro, and of course TV Teletext. I created an online simulation of it in Circuitverse that can be seen here: https://circuitverse.org/users/5735/projects/teletext-saa5050-0745b8b8-a20f-4084-9b51-10a0ebe3c802 #Teletext #SAA5050 #BBCMicro