Punchout - red is blocky and some colors are off

Bullwinkle

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I'd been working on a Sanyo monitor and finally have that back from vertical collapse. I popped it into the Punchout where it came from and I'm getting some blocks behind letters as well as a lot of red blocks behind many red objects (for instance, when Glass Joe's eyes turn red, they become a square)

pic1.jpgpic2.jpgpic3.jpgpic5.jpgpic6.jpg

I did look at some threads regarding color palette and figure that may be part of my problem. I swapped the two video cables between monitors and verified that the problem migrated to the other monitor, so the monitors themselves are fine. (as there are no problems on the upper monitor content)

Any suggestions on where to start first?

thanks,

Tom

Thanks.
 
Last edited:
It might be bad color proms. The color proms are located on the CHP1-01-BAK board, locations 6E, 6F, 7E, 7F, 8E, 8F. 3 of them are for the top monitor and the other 3 are for the bottom monitor.

I don't know which 3 go to which monitor, but try swapping some of them around to see if the problem changes/moves.

If the problem is in fact the color proms; to replace them you need N82S131N proms. That's how they're listed in the manual anyway. I've seen some on sites listed without the "N" at the end; I don't know if that matters or not. You'll also need to find someone to program them if you can't do it yourself. However, there are different versions of the Punch-Out color prom images, and proms can only be programmed once, so there is no room for trial and error trying to find the right version of the images (unless you want to keep buying proms at $3 or $4 a pop).
 
ouch...ok, I will do some swapping to see if I can ID the guilty party. Can I assume that 6E and 6F are the same color prom so when I swap them, I will see correct colors move if it's the bad prom?

thanks
 
ouch...ok, I will do some swapping to see if I can ID the guilty party. Can I assume that 6E and 6F are the same color prom so when I swap them, I will see correct colors move if it's the bad prom?

thanks

This is from an old RGVAC post:
From: MMccain584
Date: Thurs, Jul 22 1999 12:00 am
Email: [email protected] (MMccain584)
Groups: rec.games.video.arcade.collecting

If memory serves me correctly, I seem to recall failures of color PROMs. The
upper monitor set was 7F (blue), 6F (green), and 6E (red). Try swapping 6F
with each one of the other two to see if the problem changes to a different
color.

8F, 8E, and 7E is the set for the lower monitor. You could swap 6F with 8E
also for testing. I may have the upper and lower sets backwards, but I think
it was this way.

If his memory is correct, then it is not layed out like you'd expect, i.e. with the top row of proms being for the upper monitor and the bottom row of proms being for the lower monitor. According to him, it is like this:

Code:
________________________________________
| 6F (UPPER) | 7F (UPPER) | 8F (LOWER) |
|——————————————————————————————————————|
| 6E (UPPER) | 7E (LOWER) | 8E (LOWER) |
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
 
Be carefull though.. there are several prom sets floating around. It depends on what the driving mux logic looks like:
 
Be carefull though.. there are several prom sets floating around. It depends on what the driving mux logic looks like:

Awesome video.

I checked my BAK boards after watching it and both of my POs have 352s in that location (factory original chips), while my SPO has 353s (also factory original). What do you make of that?

By the way, at 13:49 where it is showing Bear Hugger's introduction screen, that should have his name in the middle surrounded by a dark green rectangle, like so:

spobh.png


On your video it looks like just a solid white rectangle where the name is supposed to be.
 
Yeah I'm pretty sure it was there. The viewing angle is not the best and I discovered today that the contrast was way off on my monitor which made it hard to show up in the video.
 
So what about the 352 chips in my two Punch-Out boardsets? What are they doing different as compared to 353 chips?
 
So what about the 352 chips in my two Punch-Out boardsets? What are they doing different as compared to 353 chips?

353's have a high impedance output, 352's don't. But it doesn't matter in this case because Punchout is not using this feature. Pins 1 and 15 are tied to ground.
 
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