to let tty run with its own page table (instead of with the kernel identity

map table), make it map in video memory.

sadly, this breaks tty in non-paged mode.

happily, this simplifies the code by throwing out the messing
around with segments, and throws out vidcopy.s.

drivers/tty/Makefile

@@ -19,7 +19,7 @@ CFLAGS = $(CPPFLAGS)
 LDFLAGS = -i
 LIBS =  -lsys -ltimers
 
-OBJ = tty.o console.o vidcopy.o keyboard.o pty.o rs232.o 
+OBJ = tty.o console.o keyboard.o pty.o rs232.o 
 
 # build local binary 
 all build:	$(DRIVER)