32X Playing Virtua Racing

[omp]

Here is the link to where Tim has the audio samples http://www.smspower.org/forums/viewt...ghlight=ym2413 again I must have been VERY lucky as you will discover. It was lucky as at the time these were the only 2 FM games I had lol (or maybe it was just R-type...shit it was so long ago)!

Rev 1- 0108 HABG works fine (must have ass'ed this)

Rev 1.1 (both the same) - 9904 HAAG Both work fine

I will be getting another board from him in his next batch, I might grab a spare YM2413 from him. He also thought it strange mine (at the time) played fine. Unfortunately as I said I have removed this FM board as I upgraded to the Rev 1.1 as it was easier to get to work with Wonder Boy 3 and Time Soldiers.

Edit, I just realized that audio file of Scramble Spirit sounds shit. Mine DOES not sound like that..... It sounds heaps out of tune...

[Ace]

Rev 1- 0108 HABG works fine (must have ass'ed this)

Fake. That chip is notorious for sounding completely off from a real Yamaha chip, and many of them have broken instrument ROMs on them. I would need a sample from that YM2413.

Rev 1.1 (both the same) - 9904 HAAG Both work fine

Some people claim this chip is real, but considering it's made at the same factory as my 9836 HAAG chips, I say they're both counterfeit chips.

[omp]

I was planning on either

A/selling that Rev1 board for cheap or
B/using it for this consolized GG project (since it is harder to make work with WB3 and Time Soldiers, which won't work on a GG anyway since it is missing 2 of the required signals).

I find it strange that the sample he put up of Scrambled Spirits sounds so off. Perhaps when I compared the audio file of R-Type (I DEFINATELY had that game when he posted the audio files, now thinking about it I may have gotten Scramble Spirits later) it was that one game that was ok.

This is a problem that plagues me, is having time to do more than just throw a cart in the console, listen to it for 30 seconds and that is it. For the last 4-5 years I have had 2 jobs, job number 2 was only ever supposed to have been a hobby (ironically enough to pay for my other hobby-RC planes/helicopters which I haven't touched in years). This is an error that will be fixed in the new year when I tell job number 2 "no more".

[chessage]

Thanks to the information provided in this thread, I can confirm that connecting a pull-up resistor rated at 10K ohms to DTACK fixes the system instability.

[villahed94]

Yep. Although VR with a 6.8KOhm pull-down resistor works fine. It would be worth giving a shot to that modification with Chaotix.

[chessage]

It would be worth giving a shot to that modification with Chaotix.

That's a different issue.

[Ace]

Thanks to the information provided in this thread, I can confirm that connecting a pull-up resistor rated at 10K ohms to DTACK fixes the system instability.

10Kohm pull-up resistor, you say? *gets 32X to solder in pull-up resistor*

[omp]

Is that from the service bulletins?

[chessage]

^No.

[RichB93]

Sorry to bump this but can anyone provide a schematic of this mod for me? I'm a bit of a newbie when it comes to this kinda thing. From the posts here I assume that this'll fix the VR compatibility as well as stability for the Game Genie, but will be otherwise identical to having not performed the mod?