Fixed emulation of SU (Scroll Up) in Term::Emulator; now output for my captured input from a specific QEMU run works completely correctly (matches the output of xterm).
Working on hooking Term::Emulator up so that it can be used with a PTY on one end and a filehandle on the other so that it can be fed output from, for example, QEMU's -curses output and produce plain text on the output filehandle, suitable for Expect.