cpuburn is is a set of programs that load x86 CPUs as heavily as possible for the purposes of system testing. FPU and ALU instructions are coded in an endless loop in an attempt to maximize heat production from the CPU, putting stress on the CPU itself, the cooling system, the motherboard (especially voltage regulators), and power supply. The tests may damage undercooled, overclocked, or otherwise weak systems and cause data loss or permanent damage to electronic components.
The Google Serial Graphics Adapter BIOS, or SGABIOS, provides a means for legacy x86 software to communicate with an attached serial console as if a video card were attached. It is designed to be inserted into a BIOS as an option ROM to provide over a serial port the display and input capabilities normally handled by a VGA adapter and a keyboard, and additionally provide hooks for logging displayed characters for later collection after an operating system boots. It is designed to handle all text mode output sent to the legacy video BIOS int 10h service routine. Int 10h is the most common method for displaying characters in 16-bit legacy x86 code.