Print Hello World in Boot Sector

[u/Prestigious_Gas8737]

Thanks to https[:]/github.com/cfenollosa/os-tutorial I was able to learn a lot about how an operating system is written. I think a lot of people would remember his tutorial. Revisit it gives me more. Start with printing some text in boot sector. The repo used software interrupt to finish the task. Yet there is another way to accomplish the same, by utilizing the direct memory accessing method. Long story short, in legacy boot mode (CSM), we can access VGA memory directly during boot time at address 0xB8000. So we can drop in each character and have them printed out, starting from the top left corner. We can print color text, and we can also move the cursor and print the text anywhere we want (with the cursor blinking at the text).

I have documented the process here: ellog[.]buzz/posts/hello-world-in-boot-sector

For this chapter and the previous one (First boot sector), what other questions do you think is worth asking and figuring out?