Where to find 7404 inverter chips?

jimbodeanny

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I'm trying to find a source for 74LS04 inverter chips. I need one to convert the positive sync on my Frogger to negative. I stopped at Radio Shack and they didn't have them. Does anyone know of an easy (preferably local) source for these? I'd rather not pay to have just one cheap chip shipped :)

Thanks
 
Yeah man best solution is to just order 10 bucks worth of stuff from somewhere that you might need down the line. I'm kind of surprised radio shack didn't have them, some of the stores have some of that stuff and that's a real common part.

Other option is to steal one off a parts board or something if you have one around. Or even just ANY old board, maybe out of a toy or something or t.v. might have some of that stuff, I don't know get creative. Kind of sucks having to order just 1 chip, I feel ya!
 
I'm trying to find a source for 74LS04 inverter chips. I need one to convert the positive sync on my Frogger to negative. I stopped at Radio Shack and they didn't have them. Does anyone know of an easy (preferably local) source for these? I'd rather not pay to have just one cheap chip shipped :)

Thanks

All the Frogger boards I've seen output negative sync....
 

While I value Ken's input greatly, he is not always right. :D
There is more than one kind of Frogger board though.... there is the 36-pin (classic Konami pinout) and a 44-pin (DC Galaxian style).
Which one do you have?
I can tell you that all the 36-pin Frogger boards I've come across output negative composite sync. I don't have a 44-pin board on hand to confirm, but I don't see why they would output positive sync either (since it is Galaxian-based hardware).
 
I recall one of our Froggers 20 years ago had positive sync output and had some really phony monitor in it from the factory.
 
While I value Ken's input greatly, he is not always right. :D
There is more than one kind of Frogger board though.... there is the 36-pin (classic Konami pinout) and a 44-pin (DC Galaxian style).
Which one do you have?
I can tell you that all the 36-pin Frogger boards I've come across output negative composite sync. I don't have a 44-pin board on hand to confirm, but I don't see why they would output positive sync either (since it is Galaxian-based hardware).

I recall one of our Froggers 20 years ago had positive sync output and had some really phony monitor in it from the factory.

Konami 36-pin Frogger is -CSync.
Sega 36-pin Frogger is -Csync
Sega 44-pin Galaxian/Moon Cresta style Frogger is -Csync.

I have all 3.

If you look at the scat, you will see that all frogger boards are capable of either positive sync or negative sync. It is a simple pinout swap in the wiring to the edge connector. The Sharp monitor and the Nanao both used negative sync, while some other un-named monitor that was used by Sega was positive sync.

I personally have taken a working positive sync Frogger and swapped it over to use negative sync with a G07 without using any kind of inverter chip or mod.

Once again Cupcake, learn to read before you spew your all knowing crap onto others.

Let me also say that once again Ken Layton is CORRECT.
 
Wow, now I am confused. Is Frogger positive or Negative sync ? Well I had also assumed it was positive sync only because the plug on my Frogger monitor harness has a one piece 6 pin inline plug which was plugged into the top 6 pin plug on the interface card on the WG K4600 monitor which was in the game when I bought it and the top 6 pins are for the positive hook up. I recapped the monitor and adjusted it with my MT830A monitor signal generator which only has positive sync. The 3 negative sync pins on the interface card are so corroded I am sure nothing had been plugged into it for a long time but the picture on the game never would sync all the way, it always wanted to drift but I just assumed the monitor needed a cap kit. Now that I think about it, I tested the Frogger board in my JAMMA cabinet with a Konami 36-pin adaptor I bought for my Gyruss board and it worked on that monitor with no problems and I also tested my Pac man board in the same cabinet with a Pac man Jamma adaptor and it worked fine too and I know Pac man is negative sync. Unless my monitor in the Jamma cabinet can do both positive and negative sync boards without changing wires then Frogger must also be negative sync. That might explain why the game never would sync to the K4600 monitor because it was wired for positive sync. Well I guess I'll find out when I reinstall the monitor in the cabinet but I decided to sand and repaint the black on the cabinet first. Hope yall figure it out.:D
 

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If you look at the scat, you will see that all frogger boards are capable of either positive sync or negative sync. It is a simple pinout swap in the wiring to the edge connector. The Sharp monitor and the Nanao both used negative sync, while some other un-named monitor that was used by Sega was positive sync.

I personally have taken a working positive sync Frogger and swapped it over to use negative sync with a G07 without using any kind of inverter chip or mod.

Once again Cupcake, learn to read before you spew your all knowing crap onto others.

Let me also say that once again Ken Layton is CORRECT.

Ok so it looks like you are right Ken, depending on how you wire up the plug it can be either one. :D
Nice to know :)
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To add more confusion to this mess......I've (personally) seen 36-pin Froggers running on positive.....and I've seen them running on negative. So.....everyone's right :)

Some have factory jumper wires on the PCB's to change the sync. I've probably got some of both here.....if anyone really needs a picture.

Edward
 
If you look at the scat, you will see that all frogger boards are capable of either positive sync or negative sync. It is a simple pinout swap in the wiring to the edge connector. The Sharp monitor and the Nanao both used negative sync, while some other un-named monitor that was used by Sega was positive sync.

I personally have taken a working positive sync Frogger and swapped it over to use negative sync with a G07 without using any kind of inverter chip or mod.

Once again Cupcake, learn to read before you spew your all knowing crap onto others.

Let me also say that once again Ken Layton is CORRECT.

Saying that Frogger is positive sync is not "correct".
If there is a simple way to flip the sync polarity on a Frogger board then that is very useful information that we would all benefit from, and may help the original poster immensely. So why don't you make your post useful and share that info? Or did you just respond so you could take a poke at Spaeth? (I assume he is the one you affectionately refer to as Cupcake)
 
If you look at the scat, you will see that all frogger boards are capable of either positive sync or negative sync. It is a simple pinout swap in the wiring to the edge connector. The Sharp monitor and the Nanao both used negative sync, while some other un-named monitor that was used by Sega was positive sync.

I personally have taken a working positive sync Frogger and swapped it over to use negative sync with a G07 without using any kind of inverter chip or mod.

Lol I'm even more confused now. I looked at the schematics posted, but I'm not sure what I'd have to do to change it. Could you explain how you did this so that I might try that?
 
To make it more confusing, I've found that if you hook a positive sync to negative, etc. you do get sync, the game is just cut in half in the middle of the screen. So if you're getting no sync at all, you may have a different sync problem then just having the polarity reversed.
 
If you look at the scat, you will see that all frogger boards are capable of either positive sync or negative sync. It is a simple pinout swap in the wiring to the edge connector.

Once again Cupcake, learn to read before you spew your all knowing crap onto others.

You might want to work on your reading comprehension a bit, before spewing your ignorant vitriol once again.

I said they all have -CSync. The fact that some boards also have +HSync and +VSync doesnt' change that fact. They do *not* have +CSync.

Note that the original posting said he needed to invert the sync (singular) not syncs (plural), implying that he's referring to composite sync, not separate syncs.

Nice try, though, Twinkie.
 
Saying that Frogger is positive sync is not "correct".

Matt, you are simply mistaken.

Lol I'm even more confused now. I looked at the schematics posted, but I'm not sure what I'd have to do to change it. Could you explain how you did this so that I might try that?

Let's clear it up for you then.

In accordance with the Frogger cabinet wiring diagram #700-0067 & 700-0070 (36 pin edge conn version)
Pin N of the edge connector goes to +V sync
Pin S of the edge connector goes to +H sync
Pin 14 of the edge connector (negative composite sync) is not connected

In accordance with the Frogger cabinet wiring diagram #700-0068 & 700-0069 (44 pin edge conn version)
Pin 13 of the edge connector goes to +V sync
Pin 12 of the edge connector goes to +H sync
Pin 17 of the edge connector (negative composite sync) is not connected

Hope this clears things up for everyone that, YES Frogger puts out positive sync as well as negative composite sync.
 
Note that the original posting said he needed to invert the sync (singular) not syncs (plural), implying that he's referring to composite sync, not separate syncs.

Quit with the semantics Cupcake, the guy said he wanted to run positive sync on a Frogger and it can be done easily.
 
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