kingcar
Enthusiast
Very nice! Would be down for one of these.
Neo geo Kizuna Encounter 4p board
- Thread starter xb74
- Start date
Update:
I got the remaining parts and assembled the first PCB. Pulling out1/out3 high/low shows that the circuit works in the test menu, I can select the P3/P4 and simulate A/B buttons. Though the bios doesn't detect the 4 player mode.
Right now I am not sure if that is because of a problem in furrtek's schematic or the 161-in-1 cart I'm using.
Some things DO seem to work, though: For example some games use the normal P1, other games use the P3. Some strange things are going on with the start buttons as well... Sigh. I'll need to have a closer look at the photos and the MVS bios...
Could someone with the 4p board and a voltmeter confirm a few things?
- how is the cable wired that goes from the board to the 8-pin connector on the mvs?
- can someone confirm that the 4p detection uses buttons A and B? https://wiki.neogeodev.org/index.php?title=CONTROLLER_SETUP
I got the remaining parts and assembled the first PCB. Pulling out1/out3 high/low shows that the circuit works in the test menu, I can select the P3/P4 and simulate A/B buttons. Though the bios doesn't detect the 4 player mode.
Right now I am not sure if that is because of a problem in furrtek's schematic or the 161-in-1 cart I'm using.
Some things DO seem to work, though: For example some games use the normal P1, other games use the P3. Some strange things are going on with the start buttons as well... Sigh. I'll need to have a closer look at the photos and the MVS bios...
Could someone with the 4p board and a voltmeter confirm a few things?
- how is the cable wired that goes from the board to the 8-pin connector on the mvs?
- can someone confirm that the 4p detection uses buttons A and B? https://wiki.neogeodev.org/index.php?title=CONTROLLER_SETUP
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Does anyone know what I need to look out for when running code on the real hardware? My test program runs in Mame, on my unmodded MVS I boot into a cross hatch screen, on my unibios board I get a black screen.
Edit: As usual, found the problem RIGHT after posting... I am using a 27c160 (because all my 27c800 seem to be broken...), and A20 (A19) is held high from /PORTADRS. Copying the tool into the second half of the EPROM fixes it:
Now I just need to debug the circuit...
Edit: As far as I can tell furrtek's schematic is correct, and I get similar results to a simulation in mame with the kizuna4p driver. I think the problems point to some short circuits, so I'll have to go through the PCB and see if anything is wrong...
Edit: As usual, found the problem RIGHT after posting... I am using a 27c160 (because all my 27c800 seem to be broken...), and A20 (A19) is held high from /PORTADRS. Copying the tool into the second half of the EPROM fixes it:
Now I just need to debug the circuit...
Edit: As far as I can tell furrtek's schematic is correct, and I get similar results to a simulation in mame with the kizuna4p driver. I think the problems point to some short circuits, so I'll have to go through the PCB and see if anything is wrong...
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Quick update (you are not forgotten)...
- if I connect a scope and probe the various lines I am getting the correct results
- my test program running on actual hardware only works correctly for the first edge
- I do think I know what the problem is, though I need to order some parts
I had a lot of time and energy taken up by work, and I'll be a bit busy with a family matter, so I'll try to continue with this later this month.
Update: this is how the program works in kizuna4p in Mame:
216-p1.zip replaces the program rom of kizuna, if you launch it with kizuna4p mame will emulate the 4p adapter.
- if I connect a scope and probe the various lines I am getting the correct results
- my test program running on actual hardware only works correctly for the first edge
- I do think I know what the problem is, though I need to order some parts
I had a lot of time and energy taken up by work, and I'll be a bit busy with a family matter, so I'll try to continue with this later this month.
Update: this is how the program works in kizuna4p in Mame:
216-p1.zip replaces the program rom of kizuna, if you launch it with kizuna4p mame will emulate the 4p adapter.
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xb74
Grand Master
An interesting listing popped up on Yahoo that is semi-related.
https://page.auctions.yahoo.co.jp/jp/auction/c1000653188
https://page.auctions.yahoo.co.jp/jp/auction/c1000653188
redorlando101
Student
Put me down for one!
It looks like I need to rework the PCB a bit, and get a new revision. Though while probing around yesterday I somehow managed to damage the VRAM, so I need to fix that as well ... sigh.
BTW: I am 99% sure that the problems are timing related, though the HC/HCT should be fast enough up to 50Mhz. Does anyone have an idea what to look out for?
BTW: I am 99% sure that the problems are timing related, though the HC/HCT should be fast enough up to 50Mhz. Does anyone have an idea what to look out for?
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redorlando101
Student
What became of this? I could use one.
MVS-Scans has good scans of it:
https://www.mvs-scans.com/index.php/NEO-FTC1B
Though it is good to know someone who has it to test stuff.
(BTW: I replaced the VRAM and the MVS is working again.)
redorlando101
Student
I'm super interested!
xb74
Grand Master
Bump, to see how things are progressing and if the community can help out at all?