This was a simple project I finished a while ago, but never wrote anything about.
The lack of this device was discovered while debugging my 6502 computer (which I will cover later). I needed to debug the address bus while stepping through a simple program in ROM. Due to the lack of a advanced oscilloscope, I wanted a solid device I could hook up to anything with a 16 bits wide bus or less.
This is the final layout. The address bus is segmented in 4 bits, each passing through a MC14495, which happens to be a CMOS 4-bit parallel to 7-segment driver. All I did was to connect the dots and add a few rails for the power, and etch the bugger.
Yes, it is a simple device, but it has proved to be extremely functional and useful.