Writing my own BIOS

Question

I\'m not crazy, just reinventing the wheel :D
I wrote boot-loaders, mouse & keyboard mini-drivers, mini OS and so on.

I\'m always trying to avoid DOS inter

Answer 1

BIOS can be written in any of your favorite language, although lower level languages give you more control. Assembly and machine code are almost the same, the difference being microcode interface and what you type, eg. for machine code you'd only type 2 characters, and assembly give you alphanumerics. My hunt for custom BIOS began when I needed computer to boot up every few hours and haven't found any BIOS that does that.

To flash BIOS, follow manufacturer guidelines. BIOS has now been replaced with UEFI (for added security). Checkout: https://www.pcworld.com/article/187437/how-to-update-your-bios.html

x86 and amd64 instruction reference: https://www.felixcloutier.com/x86/
x86 instructions with extensions: https://en.wikipedia.org/wiki/X86_instruction_listings
i386 instruction ref: https://css.csail.mit.edu/6.858/2014/readings/i386.pdf
x86 Assembly Guide: https://www.cs.virginia.edu/~evans/cs216/guides/x86.html
Intel Instruction Set Ref: https://software.intel.com/sites/default/files/managed/a4/60/325383-sdm-vol-2abcd.pdf