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Irken (MiSTer) JAMMA Expander

I have a MS8 monitor and keep getting a rolling sync on Rtype and running 8Bit computers. I’ve tried turning sync off and it’s still the same. Other games play fine though

Any ideas
 
NFGx said:
I threw some 220s in there, and it worked a treat.

As an aside, @invzim, the JAMMA Expander doesn't seem to save the 31kHz preference. When I'm using it with my 31kHz-only Naomi monitor, it's extra work to select this mode every time it powers up. Is there an INI setting on the JE's SD card I can use, maybe?
Click to expand...
Check the .ini file - make sure the card is not formatted with ex-fat, it should save ok...
Beaps said:
I have a MS8 monitor and keep getting a rolling sync on Rtype and running 8Bit computers. I’ve tried turning sync off and it’s still the same. Other games play fine though

Any ideas
Click to expand...
Check the video-info OLED screen on the expander, if it's not blocking it's the mister core. Got an MS8 (aero city) myself, and I think I've checked r-type.
 
Nah definitely something wrong here, sync is off and nothing on the OLED is showing as an issue, rtype 1 and defo have sync issues
 
IIRC a lot of the IREM games use non-standard sync rates. Have you tried other RTypes, or Mr. Heli, etc? They use the same core on MiSTer too, so we can minimize the different causes of the problem here. Maybe delete any configs for the game as well, see if something's been tweaked previously.

I know on my MS9 it's totally fine. The MS8 isn't reputed to be a lot less capable.
 
Hi, it works fine on my Kyotaro, which uses a MS8.

IMG_3549.jpg
 

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Sorted it do now, sorry it was my dodgy sync pot lol.

I do have another issue tho. I’m try the ST core and the sync blocker has stopped it working. I’ve turned off the sync protection and it still blocking it.

Any ideas
 
the OLED on the ST core says sync blocked, the OLED on the Saturn core goes off completely
 
Beaps said:
the OLED on the ST core says sync blocked, the OLED on the Saturn core goes off completely
Click to expand...
I mean the "Video Input" info screen on the OLED on the Expander - this will probably give you some hints. I haven't checked myself, but likely a direct_video core issue?
 
This is the video input screen
 

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Had a look at the scope and did a quick google, seems the Atari ST clone is not working with direct_video, probably the same issue with Saturn which is in active development.
 
Ah ok, thanks for taking the time to look into this for me.
 
Can I ask, is it possible to use a raspberry pi instead of a DE10 Nano?
 
Beaps said:
Can I ask, is it possible to use a raspberry pi instead of a DE10 Nano?
Click to expand...
In theory yes, but I think you will struggle a bit to get the PI to output 15khz via HDMI like the DE10 does. Not tested, nut supported and not recommended - but could be fun :)

You would need a type A extension cable between the Expander and the PI, and some kind of cable hack to actually power the PI - check out the diagram here:
https://irkenlabs.com/jamma-expander/hardware-details/
 
There are a few 15khz builds out there for pi already. I think you have to use the IO pins for the output. Maybe some kind of IO to HDMI might do the trick?
 
Not sure where this is going - what's the point of using a Pi with this? I thought the whole idea was you would want to use a FPGA on your cab. If you want to use a Pi, aren't there other ready made options for that?
 
I’m just thinking to play games that ain’t available on MiSTer yet, a stop gap if you like. Sure there are similar devices like Pi2Jamma but if you could leave the DE10 in it’s place and hook up a Pi temporarily I think that that would be awesome
 
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