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Killer Instinct Dual Board

neku said:
Hello guys !

It's with great pleasure that I announce the opening of the source code for the ROM and tools I've been working on for the past two years.
Some tools are missing for now, like the tool to unpack the game rom, it will be added once the code has been cleaned up.

This source code is of the new version 2.0 ROM rewritten in C.
Click to expand...

@neku I just want to say that what you've done here is unbelievable. I've owned a KI1/2 PCB for many years and it always pissed me off that MAME has always had a bug that intro audio never loaded. The "hack" was to change the volume and the intro music started working.

If I use your BIOS in Killer Instinct 1 and 2 and set the correct DIP switch to auto bypass your startup menu, apart from the CRC chip failure, the audio works perfectly! For the first time in MAME, identical to the PCB!!! Thank you!!!
 
leonk said:
@neku I just want to say that what you've done here is unbelievable. I've owned a KI1/2 PCB for many years and it always pissed me off that MAME has always had a bug that intro audio never loaded. The "hack" was to change the volume and the intro music started working.

If I use your BIOS in Killer Instinct 1 and 2 and set the correct DIP switch to auto bypass your startup menu, apart from the CRC chip failure, the audio works perfectly! For the first time in MAME, identical to the PCB!!! Thank you!!!
Click to expand...
What dip switch do you use to bypass the boot menu?
 
leonk said:
@neku I just want to say that what you've done here is unbelievable. I've owned a KI1/2 PCB for many years and it always pissed me off that MAME has always had a bug that intro audio never loaded. The "hack" was to change the volume and the intro music started working.

If I use your BIOS in Killer Instinct 1 and 2 and set the correct DIP switch to auto bypass your startup menu, apart from the CRC chip failure, the audio works perfectly! For the first time in MAME, identical to the PCB!!! Thank you!!!
Click to expand...
That bug was fixed in the latest mame by hap:
https://git.redump.net/mame/commit/?id=857c566cb3a12b24c74e28e6efe6d9a84e740ddc
 
MickyMac said:
That bug was fixed in the latest mame by hap:
https://git.redump.net/mame/commit/?id=857c566cb3a12b24c74e28e6efe6d9a84e740ddc
Click to expand...
I saw this commit recently and actually this change introduces issues if you are disabling DRC, every read to the ROM (data and instructions) are getting this latency penalty; making mame for KI emulation unusable on architecture not supporting DRC.
Also the fix is inaccurate, now loading time on mame are slower than on real hardware.
I am not a big fan of this fix, looks more like a bandaid on an emulation accuracy problem.
 
That could be useful information to the devs neku. Maybe post that info to the patch author? This is the commit on the mame github with option for posting comments at the end:
https://github.com/mamedev/mame/commit/857c566cb3a12b24c74e28e6efe6d9a84e740ddc


Or if you are familiar with c++ the source file can be edited to fix it and a pull request made:
https://github.com/mamedev/mame/blob/master/src/mame/rare/kinst.cpp

Actually looking the comments in the source file it looks like they are aware this is not correct:
TODO:
- The SRAM test fails in diagnostics; this is due to the fact that the test
relies on executing out of the cache while it tromps over (and eventually
restores) the instructions it is executing; this will likely never be fixed.
- Verify waitstates on memory access, currently it's only added for EPROMs
during the blue screen boot up sequence.
 
neku said:
I saw this commit recently and actually this change introduces issues if you are disabling DRC, every read to the ROM (data and instructions) are getting this latency penalty; making mame for KI emulation unusable on architecture not supporting DRC.
Also the fix is inaccurate, now loading time on mame are slower than on real hardware.
I am not a big fan of this fix, looks more like a bandaid on an emulation accuracy problem.
Click to expand...
I tried to backport this fix into a MAME rev I'm running from last summer when I upgraded my MAME computer from 2010 (easier to fix MAME than try to update the ROMs on my custom build) Unfortunately, my build VM is still on Windows 7 (I do most dev in Linux) The issue is that when you call 'pacman' to update the tools to build MAME, all the build tools (MSYS2, etc) have all migrated to win8 as the minimum requirement in 2024. MSYS2 now tells me it's missing specific Windows DLL's to execute. Luckily MAME/GroovyMAME still maintain old build systems that generate win7 compatible binaries, but setting up a new one today on win7 is a loss cause.

Luckily, Neku's BIOS works great in older MAME with no visible issues.
 
I cant believe i read this whole thread...

Just as I bought my KI pcb got exited till the end of this thread and damn , its July 23rd. I hope Neku makes this dream possible for all of us to just click purchase and call it a day.

Unbelievable work and progress. Truly a genius. And to the other guys too who started the mod, truly geniuses. Very impressive. Wow.

Oh yeah, im definitely interested.
 
@BladeZX Did you ever make updates to your PCB to address the misalignment of the sockets causing the PCB to bend? I'm interested in doing this MOD for dual boot as it seems the most approachable and simpler at this time.
 
BladeZX said:
Not yet - but I do plan to do this
Click to expand...
Would you have an idea when you'll be able to do the update? Or if you're willing to drop the design files and I can try to assist in aligning them. All the parts for mine will be here in a few days, so figured I could tackle this and get it ordered once verified.
 
raynex said:
Would you have an idea when you'll be able to do the update? Or if you're willing to drop the design files and I can try to assist in aligning them. All the parts for mine will be here in a few days, so figured I could tackle this and get it ordered once verified.
Click to expand...
@raynex
Here are the kicad files
 

Attachments

raynex said:
You can see the PCB buckle in other users who ordered the PCBs in this thread (like prior to page 12, i believe). Needs adjusting to alleviate that buckling.
Click to expand...
Sorry, I don’t know how to read. 😟 Can you read it for me?🤔
 
Last edited:
HardAzRockz said:
Sorry, I don’t know how to read. 😟 Can you read it for me?🤔
Click to expand...
good thing you don't need to read to look at pictures!
Lemony Vengeance

Post in thread 'Killer Instinct Dual Board'

image.jpgimage.jpgimage.jpg

While i was able to get the 8 roms line up and socketed, There’s a LOT of flex on both PCBs. The u98 rom is indeed misaligned
  • Like
mthngn

Post in thread 'Killer Instinct Dual Board'

Lemony Vengeance said:
image.jpgimage.jpgimage.jpg

While i was able to get the 8 roms line up and socketed, There’s a LOT of flex on both PCBs. The u98 rom is indeed misaligned
Click to expand...
I confirm. It’s difficult to introduce dual board on mobo. But i success with additional parts (look at the pictures)

Whatever, thank you @BladeZX
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