An attempt to aggregate some of my findings on OS Dev learning resources
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Various articles on (mostly) older/32 bit x86, but plenty to get started for 64 bit as well.
Iterative series, from bootloaders to interrupts, processes, and userland in a protected mode kernel.
Information on most (or all) x86 BIOS and DOS interrupts. I think this is an aggregated site of Ralf Brown's interrupt lists.
Alternative list of x86 interrupts, very minimal, useful if you only need to remember the parms/interface.
Pages taken/converted from the intel spec, a good online reference for specific instructions.
If you need information density as to the format of a given x86 instruction. There are also links for 64 bit long mode instructions and other list formats.
Great list of OS and programming related books.
Making a 16 bit bootsector to load and run a 32 bit protected mode C kernel. Incomplete, but great for getting started.
Everything you'd need to know for a reference on how to program Intel x86 CPUs. See here for the single pdf with all combined volumes.
For accessing higher video modes & resolutions than the base modes from e.g. int 10h provided by the BIOS.
Unified Extensible Firmware Interface and Advanced Configuration and Power Interface specifications. UEFI is meant to wholly replace BIOS interrupts as a modern interface to system firmware. ACPI covers hardware discovery and configuration.
Also see related specifications and documentation for uefi and acpi.
My preferred assembler for speed and object size.
Widely supported and available assembler, also comes with a nice disassembler 'ndisasm'!