Add SFG-01/SFG-05(Yamaha UCN-01) extension support for MSX

[denjhang]

I tried to enter the following command in the console:
mame fsa1wsx -cart1 sfg05
But it doesn't work. I didn't see ym2151 in the sound list when mame started running.

[denjhang]

It seems that fsa1wsx does not support sfg05

[denjhang]

SYSTEM SLOT NAME SLOT OPTIONS SLOT DEVICE NAME

---

fsa1wsx centronics ap2000 Epson ActionPrinter 2000
chessmec Tasc ChessMachine EC Interfac
e
covox Covox Speech Thing
covox_stereo Covox (Stereo-in-1)
ex800 Epson EX-800
lx800 Epson LX-800
lx810l Espon LX-810L
p72 NEC PinWriter P72
pl80 COMX PL-80
printer Centronics Printer
samdac SAMDAC
smartboard Tasc SmartBoard SB30 Interfac
e

             cartslot1        bm_012           MSX Cartridge - BM-012
                              moonsound        MSX Cartridge - MoonSound

             cartslot2        bm_012           MSX Cartridge - BM-012
                              moonsound        MSX Cartridge - MoonSound

             fdc:0            35dd             3.5" double density floppy dr

ive
35ssdd 3.5" single-sided double dens
ity floppy drive

[denjhang]

In fact, in openmsx, almost all msx can use sfg01 or sfg05 as an expansion sound card.
The real msx, almost all models also allow to expand sfg05.

[happppp]

On real MSX, these proprietary Yamaha modules can be connected to a regular cartridge slot with an adapter, but indeed MAME doesn't support it.
https://www.msx.org/wiki/Yamaha_UCN-01

Can you change the issue title to something like "MSX Yamaha SFG01/SFG05 not working on regular cartslot"
BTW this is not a user help forum, it is for issues in MAME itself. This report turned out to be a real issue though.

[denjhang]

In fact, I reported similar content early, but I expressed it improperly. So I make another request: adapt YAMAHA SFG series modules.This must be a useful feature.Currently only the CX5M supports this extension, but virtually all MSXs can use an adapter to connect to the SFG.