Git repo on learning to make a toy OS.

sudo apt-get install vgabios bochs bochs-x bximage	

1. Download Bochs from http://bochs.sourceforge.net/
2. In terminal, run below:

tar -vxzf bochs-2.6.9.tar.gz	
cd bochs-2.6.9	
./configure --enable-debugger --enable-disasm	
make	
sudo make install	

• In terminal, run: bximage.
• Follow the instruction and select the option fd, then select a name for the floppy

• To compile: nasm boot.asm -o boot.bin
• Create floppy image a.img by bximage
• To write into floppy dd if=boot.bin of=a.img bs=512 count=1 conv=notrunc
• To run in Bochs with debugger: bochs. Then type enter, type c

• Create floppy image pm.img by bximage
• To compile and write into floppy: make all (make clean also available)
• To start the FreeDos image: bochs.
• To start the OS image:
  • in Bochs terminal, clean up floppy b by format B: (for the first time only)
  • type B:\[image_name].com

• Create floppy image a.img by bximage
• To compile and write into floppy, please review the Makefile, or simply: make image
• To run in Bochs with debugger: bochs. Then type enter, type c

1. Additionally, create a hard disk image 80m.img by bximage: Type: hd, Kind: flat, Size: 80, Name: 80m.img
2. And add these 2 lines in .bochsrc file:

ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14	
ata0-master: type=disk, path="80m.img", mode=flat	

3. To partition the HD:

• /sbin/fdisk -c=dos -u=cylinders 80m.img
• Then partition the HD in fdisk command line, refer to https://www.geeksforgeeks.org/fdisk-command-in-linux-with-examples/

4. On Mac's virtual machine, use fn + control + (F1 or F2 or F3) to shift among different consoles.