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overdrive 2

#1 User is offline Oerg866 

Posted 16 April 2017 - 10:59 AM

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Hi,

this is the sequel to our first demo, "overdrive". Presented at Revision 2017 in Saarbrücken, Germany.



ROM Download
Video (twitch.tv)


Tech notes:


This demo requires a flash or development cartridge with

   ■ 8 Megabytes capacity
   ■ Support for the SSF2 mapper

e.g.: TiTANDEV-MD, Mega Everdrive, ToToTek MD-Pro 64M

Due to extensive usage of a previously largely undocumented
hardware register, it will not run properly on all MD systems.

Our tests have shown that around 30% of Model I and 5% of
Model II systems experience issues. This is due to a change
in the manufacturing process of the video chip.

More detailed information will follow in the tech docs that
we'll be releasing in the coming weeks.

This demo will only run on PAL / 50 Hz systems.

At the moment, this demo will not run on ANY emulator.
Emulator developers can expect full support from us in order
to fix this (Please contact us!)


This post has been edited by Oerg866: 16 April 2017 - 01:00 PM

#2 User is offline Overlord 

Posted 16 April 2017 - 01:00 PM

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This is really really impressive, you should all be congratulated for this (I see a couple of familiar names in the credits - as well as you, Jorge & Sik are both present!)

Can you describe the testing process if this doesn't work in emulator? Was it a case of writing code and then flashing the ROM over and over in flash carts? Sounds painful.

#3 User is offline Oerg866 

Posted 16 April 2017 - 01:24 PM

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View PostOverlord, on 16 April 2017 - 01:00 PM, said:

Can you describe the testing process if this doesn't work in emulator? Was it a case of writing code and then flashing the ROM over and over in flash carts? Sounds painful.


I've created my own USB based development cartridge. It costs less than 25 euros in parts and allows you to upload code at around 5.8 MiB/s, then the cartridge initiates a hard reset and runs it. Very comfortable!
This post has been edited by Oerg866: 16 April 2017 - 01:25 PM

#4 User is offline synchronizer 

Posted 16 April 2017 - 08:31 PM

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Your work is incredible! It's too bad that you're finished with the megadrive, but is it that you all believe that you've gone as far as you can go?
This post has been edited by synchronizer: 16 April 2017 - 08:31 PM

#5 User is offline Flygon 

Posted 16 April 2017 - 09:52 PM

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As I said over at SEGA-16. Not a clue how the fuck the Titan crew some of that shit going on, but I am goddamn impressed.
This post has been edited by Flygon: 16 April 2017 - 09:52 PM

#6 User is offline Jason 

Posted 17 April 2017 - 07:03 PM

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With all that 3D, I hope Overdrive 3 is a just a superior port of Hard Drivin'.

You people are goddamn wizards.

#7 User is offline biggestsonicfan 

Posted 17 April 2017 - 07:12 PM

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Can someone ping Nemesis and get Exodus running this soon?

#8 User is offline Ralakimus 

Posted 17 April 2017 - 10:22 PM

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This demo uses an "undocumented" register that NO emulators support. While this register is actually partially documented as of now, there's still more info that will be released sometime in the future.
This post has been edited by Ralakimus: 17 April 2017 - 10:23 PM

#9 User is offline JaxTH 

Posted 17 April 2017 - 11:18 PM

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View Postbiggestsonicfan, on 17 April 2017 - 07:12 PM, said:

Can someone ping Nemesis and get Exodus running this soon?

I believe Nemesis is still busy with his Mega LD dumping project.

#10 User is offline Oerg866 

Posted 19 April 2017 - 09:10 AM

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I know Mask of Destiny is actually quite eager to get this emulated and made promising progress already. Eke hasn't shown anything yet but I'm sure he will manage ;)

#11 User is offline Mask of Destiny 

Posted 19 April 2017 - 01:07 PM

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I am indeed. The latest nightly of BlastEm (look for one dated 19-Apr-2017 or later, they are not in date order unfortunately) runs most of the demo correctly. The biggest remaining issues are in the "Titancade" portion (handling of V30 mode bit is incorrect and doesn't play nicely with the vertical border extension trick) and the rotating cube/rectangular prism(s) (suspected to be a timing issue, but I haven't investigated it yet). The horizontal border extension stuff isn't supported yet either, but that's a bit less jarring; especially since horizontal borders are not displayed with the default overscan setting. The V30 switching issue should be fixed within a day or so. The issue with the cube could be quick or painful depending on what the actual problem is.

#12 User is offline rata 

Posted 19 April 2017 - 06:26 PM

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Okay, what the fuck did I just see? Was that transparency or low bitrate tricking me into it? So it was true that Genesis Does...

I won't say awesome work because it just isn't enough... I have no words for it.

#13 User is offline Cooljerk 

Posted 24 April 2017 - 01:41 PM

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View PostOerg866, on 16 April 2017 - 01:24 PM, said:

View PostOverlord, on 16 April 2017 - 01:00 PM, said:

Can you describe the testing process if this doesn't work in emulator? Was it a case of writing code and then flashing the ROM over and over in flash carts? Sounds painful.


I've created my own USB based development cartridge. It costs less than 25 euros in parts and allows you to upload code at around 5.8 MiB/s, then the cartridge initiates a hard reset and runs it. Very comfortable!


Is this one of those USB SDKs built from those FPGA kits? This kit to be specific?

#14 User is offline Oerg866 

Posted 24 April 2017 - 08:50 PM

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Nope, completely custom design :)

Posted Image

Excuse the crustiness of this picture, this is the first one of the small production run I've built and it's been through a hellride of debugging :D
This post has been edited by Oerg866: 24 April 2017 - 08:52 PM

#15 User is offline Cooljerk 

Posted 24 April 2017 - 10:56 PM

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View PostOerg866, on 24 April 2017 - 08:50 PM, said:

Nope, completely custom design :)/>/>

<SNIP>

Excuse the crustiness of this picture, this is the first one of the small production run I've built and it's been through a hellride of debugging :D


Thats even cooler
This post has been edited by Cooljerk: 24 April 2017 - 10:56 PM

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