PDA

View Full Version : YM2413 SMS FM Sound on Game Gear help?



vexatious
09-05-2017, 03:13 AM
Can YM2413 SMS FM sound add-on somehow be used with Game Gear?

What about Sega Genesis with SMS converter adapter cart?

Would be great to have portable SMS+Game Gear console with all functions.

Thanks for any help or feedback! :)

EDIT:
Okay, it's possible to install FM sound add-on for SMS, into the Game Gear. This is cool because it is two consoles in one portable package. Thanks goes to Viletim from SMSPOWER.ORG.


http://www.smspower.org/forums/10841-SMSFMSoundExpansionBoardsAvailableNow?start=150

"Viletim" post from "SMSPOWER.ORG"

I've wired up an FM board to both the Game Gear and the Megadrive and can say with certainty that it works on both systems.

Neither system will generate a !KBSEL or receive a JOYKILL. Two games require the JOYKILL signal for FM detection, Wonder Boy III and Time Soldiers. No FM sound without a software patch for those two, unfortunately. !KBSEL is easy enough to generate from other signals on the bus. I've attached a circuit diagram below.

It's actually possible to install a board into a power base converter without any connection to the console itself. There are a couple of audio inputs provided in the cartridge slot. If you want to use these make sure you test the audio quality first - my MD2 distorts the audio considerably.

If you are hooking the board up to a converter, either the Power Base Converter or the Master Gear, make sure all relevant pins are connected. Both of my converters are non-official and the silly designers have forgotten to connect the !IORQ signal. Also, in my PBC the !RESET (!RST) line was connected to Vcc which didn't help much.


For Megadrive with Power Base Converter

SMS pin: | 2 | 4 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 32 |
Mega pin:| B28 | B16 | A19 | A25 | A29 | A01 | A26 | A20 | A15 | A03 |
SMS sgnl:| !WR | !RD | D7 | D5 | D3 | GND | D2 | D0 | A1 | A7 |

SMS pin: | 38 | 46 | 15 | 17 | 19 | 23 | 25 | 27 | 31 | 33 |
Mega pin:| B07 | B02 | A22 | A28 | A18 | A23 | A17 | A13 | A05 | A02 |
SMS sgnl:|!IORQ| !RST| D6 | D4 | GND | D1 | A0 | A2 | A6 | VCC |

B01 = left audio input, B03 = right audio input

PIC
http://www.smspower.org/forums/download.php?id=2099&sid=74145d835e728deeb067df01ae988580