Not heard of this emulator before but it supports a lot of systems, heres the release news:

vdmgr v0.1.8 is released. vdmgr is a multi-system emulator that emulates the NES, NeoGeo Pocket, Sega SG-1000 / Mark III, MCS BASIC-52, TD 4, GMC-4, Z80 computers and MSX.

vdmgr v0.1.8 changelog:
Fixed that bank of ROM was initialized when RAM / ROM of SGM was switched.
Fixed that SGM extended RAM was not initialized.

Changing to select the device when reading the ROM image in which the expansion connector device exists in the database