Support for SG-1000 roms

[Former user]

Original [issue 162](https://code.google.com/p/genplus-gx/issues/detail?id=162) created by csatech31 on 2011-04-04T16:22:00.000Z:

SG-1000 roms are not loading. Any rom that has the extention ".sg" for example zaxxon.sg are not loading which is an ealier version of the Master System or Mark III.

[Former user]

Comment # 1 originally posted by ekeeke31 on 2011-04-04T16:38:58.000Z:

Yes, as already stated in the Wiki Compatibility page, the Genesis was only compatible with Master System games.

SG-1000 or Game Gear games won't work because of VDP incompatibilities, which Genesis Plus GX is emulating accurately. Please understand I only added Master System compatibility mode on Genesis (which was enabled through Power Base COnverter), I did NOT added Master System emulation.

Support for other VDP variants (Master System 1 & 2, Game Gear) is planned though as an "extra" and since SG-1000 games are compatible with Master System VDP, they will become supported as well.

[Former user]

Comment # 2 originally posted by ekeeke31 on 2011-06-09T12:24:54.000Z:

[Former user]

Comment # 3 originally posted by ekeeke31 on 2011-08-07T18:26:17.000Z:

Fixed in r616