SC516 is a Z80 processor card designed for Z50Bus.

Here are the specs:

• Z80 running at 7.3728 MHz
• 128k bytes RAM (second 64k not easy to use, so best consider it to be 64k usable)
• 32k bytes ROM, which can be paged out with a single write to port 0x38
• LED for power and status indication
• Simple 9600 baud serial port
• Runs the Small Computer Monitor, with ROM BASIC and the CP/M loader included

If you want to run CP/M you will need to add is a Z50Bus Compact Flash interface, such as SC504, and a Compact Flash card with a suitable CP/M distribution installed. You will probably also want to add a more sophisticated serial card, such as SC511. All this is supported by the ROM with no configuration required.