The project is compatible with the 8-bit Workbench™ extension bus and can connect to other projects of mine:

• 8-bit Workbench™; an annotated 8-bit display that talks hexadecimal and octal. An Action-button provides a properly de-bounced signal to use with microprocessors or TTL logic.
• Terrific Timer; a versatile clock board that provides an adjustable astable clock (0.7 - 480 Hz) and a monostable pulse (110 ms). Lets you insert custom 555-timer parts.
• Binary Keyboard; adds a retro 8-bit toggling experience to your experiments.
• Hex Keyboard; turn-in a hexadecimal code (0-F) for the high- and the low-nibble. The output, a full byte (8-bits), can then be used with attached experiments. Supports a Logic Probe as well.

These are all available as kits. 

More information is on my website.