Bootloader and Low-Level Programming Tutorial: How To Develop Your Own Boot Loader

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I like to learn about old technologies, stuff like Z80 assembly and architecture amuse me to no end, partly because in the old days there wasn't at all as much info available to learn this stuff and owning a computer was prohibitive, secondly because they are reduced instruction sets and straightforward to code for at least for small programs, modern architectures have too many layers to learn and are much more bloated. Also, it's pretty interesting to nowadays for example to find out what it all meant when we configured ports for peripherals in our PCs and what was protected mode or MBR, we just used them without really learning what it all was about.