nma800
New member
Hello,
I've had an upright Vs. Dual System for a long time with Super Mario Bros. and Sky Kid in it and both of them seem to work fine. I just picked up Duck Hunt and tried to switch out Sky Kid for it but I can't seem to get it working and I'm hoping someone here will be able to help me out - maybe I'm missing something really obvious (this is the first time I've tried to do anything with the Vs. system besides turning it on and playing it). Sorry for the long post below, but I don't know which information may end up being important.
Okay, so here's what's happening: First, I removed the main PCB and installed the Duck Hunt ROM chips, removed the Sky Kid PPU and installed the Duck Hunt PPU, then switched the CPU that was on the Sky Kid side for the one that came with Duck Hunt (I believe this was a mistake, as the CPU that came with Duck Hunt was 2A04 and the others are 2A03). I also left the Sky Kid daughter board on, along with a couple other chips that were on there, because I didn't realize they were part of Sky Kid and not part of the main Vs. PCB (one was labeled PRG-1-B, the other was SK CHA). So that didn't work, both screens just flashed. I took out the two "extra" chips from the daughter board to make it match the Mario side and switched the CPU back to the original one (2A03) and then Super Mario Bros. worked, but Duck Hunt would just start up and immediately freeze.
So I finally did a little research and figured out that that daughter board didn't belong on there and removed it, then reinstalled the Super Mario Bros & Duck Hunt PPU's and CPU's. Same result: Mario works fine, Duck Hunt just starts and immediately freezes. I removed the Duck Hunt ROM chips, made sure all the pins were straight and reinstalled them. Same result. I repeated this about three more times with the same result.
Next, I thought I'd check if it was just the right side of the board that was having problems (and I'd read that the sockets get loose after having a daughter board in them, and since Mario was still working, I thought maybe the left side was okay) and decided to try Duck Hunt on the left side. At this point, I really didn't know what I was doing any more (well, more so than before). I removed all the Mario chips and installed Duck Hunt on the left side - both monitors just blinked off and on when I turned it on. I have no idea if you have to have two games installed, but I'd read that Mario has to be installed on the left side so I didn't want to try installing it on the right just to fill both sides. I then removed Duck Hunt and installed just Mario on the left side. Same result: the screens just blink off and on. If I put Duck Hunt back in, Mario works fine but Duck Hunt starts and immediately freezes (the sound starts and freezes, too).
I'm stuck now and don't know what to try next. Could one or more of the Duck Hunt ROM chips be bad? Do Mario and Duck Hunt not work with each other? Am I just missing something incredibly obvious and stupid? I searched the forums here and the closest thing I could find was someone who had a problem with their system freezing after 30 seconds or so and it ended up being a bad CPU, but I did swap the CPU between Mario and Duck Hunt a couple of times and Mario always works. I'm not ruling anything out and would be willing to try (or re-try) just about anything, but thought it might be worth mentioning what I had already tried.
Sorry again for the long post, but I'm very lost here and would really appreciate any help or advice anyone could offer. Thanks in advance!
I've had an upright Vs. Dual System for a long time with Super Mario Bros. and Sky Kid in it and both of them seem to work fine. I just picked up Duck Hunt and tried to switch out Sky Kid for it but I can't seem to get it working and I'm hoping someone here will be able to help me out - maybe I'm missing something really obvious (this is the first time I've tried to do anything with the Vs. system besides turning it on and playing it). Sorry for the long post below, but I don't know which information may end up being important.
Okay, so here's what's happening: First, I removed the main PCB and installed the Duck Hunt ROM chips, removed the Sky Kid PPU and installed the Duck Hunt PPU, then switched the CPU that was on the Sky Kid side for the one that came with Duck Hunt (I believe this was a mistake, as the CPU that came with Duck Hunt was 2A04 and the others are 2A03). I also left the Sky Kid daughter board on, along with a couple other chips that were on there, because I didn't realize they were part of Sky Kid and not part of the main Vs. PCB (one was labeled PRG-1-B, the other was SK CHA). So that didn't work, both screens just flashed. I took out the two "extra" chips from the daughter board to make it match the Mario side and switched the CPU back to the original one (2A03) and then Super Mario Bros. worked, but Duck Hunt would just start up and immediately freeze.
So I finally did a little research and figured out that that daughter board didn't belong on there and removed it, then reinstalled the Super Mario Bros & Duck Hunt PPU's and CPU's. Same result: Mario works fine, Duck Hunt just starts and immediately freezes. I removed the Duck Hunt ROM chips, made sure all the pins were straight and reinstalled them. Same result. I repeated this about three more times with the same result.
Next, I thought I'd check if it was just the right side of the board that was having problems (and I'd read that the sockets get loose after having a daughter board in them, and since Mario was still working, I thought maybe the left side was okay) and decided to try Duck Hunt on the left side. At this point, I really didn't know what I was doing any more (well, more so than before). I removed all the Mario chips and installed Duck Hunt on the left side - both monitors just blinked off and on when I turned it on. I have no idea if you have to have two games installed, but I'd read that Mario has to be installed on the left side so I didn't want to try installing it on the right just to fill both sides. I then removed Duck Hunt and installed just Mario on the left side. Same result: the screens just blink off and on. If I put Duck Hunt back in, Mario works fine but Duck Hunt starts and immediately freezes (the sound starts and freezes, too).
I'm stuck now and don't know what to try next. Could one or more of the Duck Hunt ROM chips be bad? Do Mario and Duck Hunt not work with each other? Am I just missing something incredibly obvious and stupid? I searched the forums here and the closest thing I could find was someone who had a problem with their system freezing after 30 seconds or so and it ended up being a bad CPU, but I did swap the CPU between Mario and Duck Hunt a couple of times and Mario always works. I'm not ruling anything out and would be willing to try (or re-try) just about anything, but thought it might be worth mentioning what I had already tried.
Sorry again for the long post, but I'm very lost here and would really appreciate any help or advice anyone could offer. Thanks in advance!