BcalcOS uses SysVinit as its init system.
The init system is the first process started by the kernel and coordinates the startup of the rest of the system.
Why SysVinit?
SysVinit is a traditional Unix/Linux approach to system initialization. It has been around for decades and uses startup scripts to determine how system services are started and stopped.
What Does This Mean for Users?
For most users, very little.
You can start the computer, log in, run applications, connect to the network, install software, and shut down the system just as you would expect.
Does BcalcOS Support Other Init Systems?
No. However, Devuan does provide alternatives such as OpenRC and runit.
The Short Version
BcalcOS uses SysVinit because we want a traditional, well-established Unix/Linux approach to system initialization.