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Most computers are attached to a video monitor that can be used as the system console. This monitor is either bitmapped or character mapped, but in either case, the kernel is responsible for displaying characters and emulating a simple terminal, such as VT220. The file ite.c (internal terminal emulator) is usually used for this purpose. Machines with a bitmapped screen can use code from the Amiga port (if the target machine has hardware support for graphics operations) or the Macintosh port (if it does not). If the target port has a character-mapped screen, then the code from the i386 port is the best choice for a starting base. Code for VT220 emulation can be copied from almost any port and is fairly easy to implement as a finite state machine.

Lawrence Kesteloot
Fri Jan 20 16:29:52 EST 1995