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+Requirements
+------------
+
+nasm
+gcc, clang or tcc
+
+Debugging
+---------
+
+hexdump -C image.bin | less
+
+ndisasm -b16 -o7c00h -a image.bin | less
+
+objdump -M intel -d kernel.o | less
+
+gcc -m32 -ffreestanding -c -o kernel.o kernel.c
+ld -o kernel.bin -Ttext 0x8000 kernel.o -m elf_i386 --oformat binary
+objdump -M intel -d kernel.bin | less
+
+# oformat: objdump -i lists tons of formats
+# -m: ld -V
+# -T: set text segment ot start at BIOS block 3
+# TEXT means code
+
+bochs -q 'boot:floppy' 'floppya: 1_44=image.bin, status=inserted'
+
+Some interesting breakpoints:
+
+boot loader (boot.asm, stage 1)
+break 0x7c00
+
+boot loeader after switching to protecting mode:
+break 0x7e4e
+
+Booting from 0000:7c00
+(0) Breakpoint 1, 0x0000000000007c00 in ?? ()
+Next at t=14040244
+(0) [0x000000007c00] 0000:7c00 (unk. ctxt): mov ax, 0x0000            ; b80000
+
+links
+-----
+
+https://www.youtube.com/watch?v=YvZhgRO7hL4&list=UUjrLiYrvbpXR37c0HV4PmqA
+
+http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-manual-325462.html
+http://wiki.osdev.org/Global_Descriptor_Table
+https://en.wikipedia.org/wiki/INT_10H
+http://www.osdever.net/FreeVGA/vga/crtcreg.htm
+http://wiki.osdev.org/Text_Mode_Cursor
+https://en.wikipedia.org/wiki/Calling_convention
+http://wiki.osdev.org/Main_Page
+
+other project links
+-------------------
+
+http://www.helenos.org
+https://github.com/cfenollosa/os-tutorial
+http://wyoos.org: in C++
+http://osdev.org
+https://github.com/Codepixl/CodeOS
+http://www.osdever.net/tutorials/
+http://lowelevel.eu
+http://download.tyndur.org/releases/0.2/
+https://code.google.com/archive/p/fpos/source/default/source, FreePascal
+https://mirage.io/
+http://www.jamesmolloy.co.uk/tutorial_html/