16-bit x86 VGA Programming
This code is the result of some x86 VGA programming trial and error.
boot.s contains a basic bootloader implementation that reads the first 64k bytes off the bootdisk to memory location 1000h:0000h (0x10000), the first 512bytes (200h) are a copy of the master boot record (MBR) itself. Stage2 execution therefore starts at 1000h:0200h which is setup as the entry point of vga.s.
There are some basic VGA routines in vga.s, some linear (chunky graphics) memory mode 13h 320x200 256 color, and some planar graphics in mode 12h 640x480 16 color. I have a (very) graphics mode basic font rendering implementation here as well.
I am publishing this just in case anyone else is having fun figuring out old school PC graphics as well!
last updated Monday, 19th October, 2020