V0 - Quad level LED not easily available
The Bivar H485CHDL quad level LED is not easily available from suppliers.
Consider replacing by Dialight 568-0721-111 rectangular quad level
bi-color LED.
Using a VME buffer (SN74VMEH22501DGGR), it is possible to drive 8
bi-color LEDs with only 8 signals from the FPGA.