These are dangerous not memory resident overwriting viruses. They search for first .EXE- and first .COM-file of current and DOS directories and overwrite them. On infection these viruses (except "Burma.409") manifest themselves by a video effect, then they display the messages:
"Burma.442": [Tempest - α] "Burma.563,756": Reading system configuration, please wait. SwizzleStyxx!
The viruses contain the internal texts also:
"Burma.442": Rangoon, Burma "Burma.563,756": D_a_r_k_A_v_e_n_g_e_r
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Virus.DOS.Burma is a dangerous file overwriting virus on DOS, it is written by a Bulgarian virus...