System self-test

Todo: Order of checks.

=Cartridge systems=

Information by Channelmaniac.

MVS checks
Additionnal checks are performed on MVS systems:

When a MVS board is powered up without cartridges inserted, the border color around the edges of the crosshatch screen indicates the system ROM region:


 * Green: 6 slot (ROM name ?)
 * Cyan: USA, SPU2
 * Blue: Spanish, SPS2
 * Red: Japanese, SPJ2

=UniBios tests=

The Universe BIOS does not use the above color codes to indicate errors.