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Nicholas's Toy Operating System

NTOS is my little toy project where I slowly write code for my tiny operating system which boots of a floppy. Status I have used a lot of time in my Christmas holidays to update NTOS. The additions and re-writes are Text-mode display driver extended. IDT and GDT setup routines written. Kernel is now pure 32-bit code, and is bootable by a multiboot compliant bootloader. Keyboard handler, map, and more. PIT operational. Minimal floppy disk controller driver. Functional system shell with few internal commands. Little block-orientated memory manager. LPT read/write routines. My priorities are: Finish floppy controller driver. FAT file system driver. Loadable programs. Text editor. ISO-8859-1 video character map. Requirements A x86 based computer with a 1.44 floppy drive. Screenshots Download .tar.gz Links I have found useful General: PGU - Jonathan Bartlett, Programming from the Ground Up (2003). NASM manual Assembly tutorial - A nice guide to some basic assembler understanding. Basic guide to getting started with an OS - by Gregor Brunmar. JOSH operating system tutorial - By Dr. Mohan Raj Dhanagopal. Getting started Q&A Interrupt Descriptor Table: IDT guide Another IDT guide CPU exceptions A20: A20 documentation osdev.org A20 documentation Programmable Interrupt Controller: Intel 8259A PIC Datasheet PIC documentation osdev.org PIC documentation Keyboard details: Very useful information on PC keyboards and scancodes osdev.org PS2 keyboard document