Total MD TMSS reverse engineering

[Eke]

Just for further reference, I was doing some tests around TMSS emulation and I noticed that only the 5 earliest japanese games did not write the TMSS register on startup (and therefore should fail on later models):

• Juuouki / Altered Beast (G-4001)
  Space Harrier II (G-4002)
  Super Thunder Blade (G-4003)
  Alex Kidd Tenkuu Majou (G-4004)
  Osomatsu Kun Hachamecha Gekijou - Mr Chunga (G-4005)

All these games were developped before the beginning of year 1989 and all further games have the TMSS startup code which seems to indicate that earlier models existed with the TMSS register (but without the BIOS stuff which appeared later in the mega drive's life)