Yann Guidon (YGDES) and Alex (al1) on Hackaday.io have remade of the classic TIL311 hex LED display with a microcontroller:
The TIL311 is a nice but expensive, obsolete, power-hungry hexadecimal display. The size of the PCB is the same and […] the pin mapping is similar. The PIC16F527 is […] cheap and exactly the right number of IOs.
The firmware source code and hardware design files are on Bitbucket:
ALKR has shared the board on OSH Park: