Hey folks,
I've been slowly gathering pieces to build a Jamma / Neo Geo cabinet and finally got enough together to test my MV1C board. I bought it used recently, it was pre-modded with Unibios 3. The seller said he got it long ago, was going to consolize it but never got around to it.
Anyhow, I did some testing and got it working fine on a test work area, so then moved it into its cabinet that has a proper CRT last night. I did some basic video tests as the CRT was new to me as well, it seemed to work fine last night.
This morning I wired up the controls, powered it up, and just get an Illegal instruction error from Unibios:
I undid my controller wiring in case something was grounded strangely or something, it did not fix it. I also have another JAMMA board which I inserted and seems to work fine.
Gallery with a few photos of the error, as well as an MVS cart running fine on it last night:
https://imgur.com/a/smEfn
Note that initial testing I did get a scrambled screen (last image in gallery). I had to clean the JAMMA edge several times and then it worked. I tried that again here but am not having any luck.
You can also see that the wiring for the BIOS looks a bit messy, I most certainly have not attempted to dig under the hot glue in to any of that.
Any thoughts or ideas?
I've been slowly gathering pieces to build a Jamma / Neo Geo cabinet and finally got enough together to test my MV1C board. I bought it used recently, it was pre-modded with Unibios 3. The seller said he got it long ago, was going to consolize it but never got around to it.
Anyhow, I did some testing and got it working fine on a test work area, so then moved it into its cabinet that has a proper CRT last night. I did some basic video tests as the CRT was new to me as well, it seemed to work fine last night.
This morning I wired up the controls, powered it up, and just get an Illegal instruction error from Unibios:
I undid my controller wiring in case something was grounded strangely or something, it did not fix it. I also have another JAMMA board which I inserted and seems to work fine.
Gallery with a few photos of the error, as well as an MVS cart running fine on it last night:
https://imgur.com/a/smEfn
Note that initial testing I did get a scrambled screen (last image in gallery). I had to clean the JAMMA edge several times and then it worked. I tried that again here but am not having any luck.
You can also see that the wiring for the BIOS looks a bit messy, I most certainly have not attempted to dig under the hot glue in to any of that.
Any thoughts or ideas?