Nintendo Donkey Kong TKG3 non-inverted video

elaar

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Hi all,

I have a TKG3 4-layer donkey kong set. This is ready to go into a cocktail table that I have restored, but there's a major issue; the board seems to output positive video rather than the inverted that Nintendo normally use, which obviously means this displays with a white background and wrong colors on the Sanyo.
This is a genuine Nintendo board. I have scoured the internet and found that on certain Nintendo boards you can convert the entire board to output normal video by simply soldering a jumper (in the case of Mario Brothers), and on other boards they have silkscreened required parts for it.
As this 4 layer board is rather small, there is no silkscreened area for these parts, so I believe it might have been done via jumpers.
On the TKG3-06-CPU board, I found a cut Jumper (J1) that connected to the video circuit, I rejoined this and the background went from white to black (a step closer), but the primary colors were still non-inverted. I therefore believe that there must be a few more jumpers/links to invert the RGB or change the PROM addressing as I have read some Nintendo PROMs contain both inverted and normal color sprites.

Would some kind sole mind taking a hi-res photo of the CPU board so I can compare?

Many thanks,
Andy
 
This is relevant to my interests :p

I have previously looked and asked about jumpers on 4-boards for flipscreen...

I have a spare TKG3-07-CPU board handy I am about to list for sale, so I had pics on hand and grabbed a few more for you. Let me know if you would like closeups of any particular areas. I can't see any jumpers other than J1 in the time I've stared at it...

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Picture 4, non-resized : http://img209.imageshack.us/img209/5208/file1765.jpg
 

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Hi Ballytablewiz,

Thanks a lot for posting those pics, much appreciated!
I found out that the PROMS on the board (labelled L+ and K+) were modified proms to create normal color sprites rather than the normal inverted. I swapped the PROMS with the ones in my DK 2 layer board and it worked a treat.
That J1 when cut turns the background to non-inverted.

I see that the DK 2 layer board set has a silkscreened area for flipscreen, and I can see it on the schematics, but I haven't been able to locate any schematics for the 4 board set to compare.

Thanks again,
Andy
 
I see that the DK 2 layer board set has a silkscreened area for flipscreen, and I can see it on the schematics, but I haven't been able to locate any schematics for the 4 board set to compare.

I don't think the 4-layer boardsets have it.
 
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