MMM cartridge + MSX -> ColecoVision's games

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By TaylorsEverythingChannel

Champion (415)

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18-10-2020, 16:44

I will see if I can find that in your conversion and test it in my own Muffie collection. hbarcellos found Muffie's Gyruss that had fully emulated SN76489A, but it's a beta. I've converted Coleco games like that because it's actually powerful.

By hbarcellos

Hero (649)

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18-10-2020, 17:03

TaylorsEverythingChannel wrote:

I will see if I can find that in your conversion and test it in my own Muffie collection. hbarcellos found Muffie's Gyruss that had fully emulated SN76489A, but it's a beta. I've converted Coleco games like that because it's actually powerful.

I have spoke with Muffie today and, due to his lack of time these days, he's STRONGLY considering releasing all of this development framework in order to help some other guys, like you, to continue his work.

Most conversions are extremely easy. There are two fully converted BIOS. One for games that does not use rst 38h, and the other for games like Popeye, which use it.
Joystick is fully emulated on keyboard and MSX joysticks.
Several SN76498A emulator versions: original (noise as tones) and the beta v6 (the one already released) with alpha noise emulated.
His find ram routines (the ones which made a huge difference between his conversions and the first crappy ones to pop-up around here 12 years ago. The *PAID* ones from another Brazilian.

Let me know if you're interested.

All the Best, Taylor.
:)

By hbarcellos

Hero (649)

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18-10-2020, 17:09

Forgot to mention that, original ROMS are transformed into DB files. There's a extremely simple C tool he created for that included in the files. That enables easy access for recreating (or converting) entire parts of the game. This is a substract of Tutankham which he WAS working to include MSX2 tiles and the complete new audio engine using's ShiruAFX-Play v4.

By TaylorsEverythingChannel

Champion (415)

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18-10-2020, 17:31

Okay, I do have some conversions that I would like to show him. I'm packing all my conversions up now.

By hbarcellos

Hero (649)

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18-10-2020, 17:41

I mean... he wants to give you the source code to his conversions as he's not having enough time to do anything beyond his two jobs.

He might finish Popeye, but that would most probably be all.

By TaylorsEverythingChannel

Champion (415)

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18-10-2020, 18:30

Oooooooh. Okay then, I would like to see some source. Plus, video is going to be finished uploading soon.

By hbarcellos

Hero (649)

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18-10-2020, 19:50

Hmmm. I can see you changing machines to make some of them work. Shouldn’t be that way...
I’ll send you his files.

By TaylorsEverythingChannel

Champion (415)

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18-10-2020, 20:12

Oh. Okay.

By gdx

Enlighted (6622)

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19-10-2020, 02:56

It's interesting but it would have been better to say it in the right thread.

https://www.msx.org/forum/development/cross-development/cole...

Here we are talking about conversions for MSX + SN76489. I chose to use the SN76489 because whatever the ingenuity deployed, the sound conversion to PSG or SCC is less good and even sometimes bad for several games. Even openMSX doesn't emulate this chip well enough for my taste. For me sound is important in games. The SN76489 is a solution simple and inexpensive and it also allows to improve the sound by using the MSX's PSG at same time for people who prefer make enhanced conversions (like Gyruss from Repro Factory).

As for me, I prefer to make conversions first the most faithful to the originals. I only modified a few games to correct bugs or a small detail that bothered me.

Rest assured I also like the enhanced versions (Jungle Hunt, Montezuma's Revenge, Tutankham, etc are nice) and PSG versions but it's just that I don't have time to do it. I therefore privileged the pleasure of seeing the Coleco games function as on the real ColecoVision console.

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