His solution is CollapseOS, an operating system designed for resilience and self-replication, that runs upon the minimal hardware of an 8-bit Z80. It’s a pretty basic operating system so brace ...
Right along with the Z80-RIO OS providing the ability to customize the system for the target usage, the underlying hardware could also be configured with just the expansion boards required ...
The Z80 SoftCard could also run the CP/M operating system, which allowed many more programs to be used on the Apple II. The initial price for the Z80 SoftCard was $349 when it launched.