Terminal Technology
tty, console, virtual console, terminal emulator. Linus 1991 implemented. Two main implementations: framebuffer and text mode.
terminal = tty = text input/output environment console = physical terminal shell = command line interpreter
本文从终端配置、原理、畅想三个方面介绍终端
Linux内核给虚拟终端分配的字形(glyph)数组只有512个，因此无法显示完整的UTF字符。 限制512的原因是这些信息保存在内核内存中。
vt/consolemap.c
glyph
1 terminfo
2 LINUX boot init
early_serial_base: 3f8; TXR:0, LSR:5 boot/commpressed/misc.c: __putstr() BIOS call initialized video mem and erarly_serial_base vidport 3b4