Can a Matsushita work with a game that has separate sync?

modessitt

Volunteer: Encyclopedia Submission Moderator
Joined
Mar 22, 2007
Messages
33,414
Reaction score
325
Location
Austin, Texas
Can a Matsushita work with a game that has separate sync?

I have a Matsushita here that I pulled from a Millipede for repair (Millipede is still on location). I seem to have it running, but can't get it to sync. From what I can tell from the manual, it requires negative composite sync on pin 5. I am trying to test this with an Arch Rivals cab I have here. The Arch Rivals appears to have separate negative vertical and horizontal sync. The Arch Rivals monitor (K7000) works fine with that sync connected, but I cannot get the Matsushita to sync. Am I going to have to connect this to a cab that uses composite negative sync (like JAMMA) to test it properly? I have tried just connecting the horizontal, as well as tying the horizontal and vertical together, but neither help...
 
I have a Matsushita here that I pulled from a Millipede for repair (Millipede is still on location). I seem to have it running, but can't get it to sync. From what I can tell from the manual, it requires negative composite sync on pin 5. I am trying to test this with an Arch Rivals cab I have here. The Arch Rivals appears to have separate negative vertical and horizontal sync. The Arch Rivals monitor (K7000) works fine with that sync connected, but I cannot get the Matsushita to sync. Am I going to have to connect this to a cab that uses composite negative sync (like JAMMA) to test it properly? I have tried just connecting the horizontal, as well as tying the horizontal and vertical together, but neither help...

Do you have any other Atari games at the shop? I've used Matsu's in Pole Positions and System 1 games with no sync issues.
 
Do you have any other Atari games at the shop? I've used Matsu's in Pole Positions and System 1 games with no sync issues.

Unfortunately, we have very few games in the shop that currently work, and the ones that due are vectors or are pinballs. I'll probably have to take it home and throw it on the bench...
 
I got one to work in a Millipede, it had a seperate connection though for the composite sync. I think you're going to have trouble with it, but you may be able to build a simple circuit to make composite sync if you want to.
 
Matsushita's will not accept separate sync.....sorry!
You don't have a "run of the mill" JAMMA board lying around the shop?

Edward
 
Tested it with a JAMMA game and it still doesn't sync. picture looks the same whether sync is connected or not, so I need to look into this further....
 
I'm messing with one of these again, yurs later. There is a 6 pin connector on the Matsushita but after taking it all apart, pin 6 isn't hooked up to anything, pin 5 is composite sync and then it runs into a sync seperator circuit that divides it back into horizontal and vertical.

It's crazy because it's standard in some Millipedes (like this one i'm working on)... so the Millipede board has a seperate vertical/horizontal sync output, but combines them too into a composite sync.... and then the Matsushita only accepts composite sync (on pin 5) and then has to divide it back out again before it can use it.

I guess that's how all composite sync works though.
 
I don't believe you can simply combine H+V = composite. I honestly don't remember anymore. believe it or not I learned a lot about how CRT technology worked in college cause I majored in video production. I even learned how the whole raster scan and scanline thing worked. LOL

though maybe I'm wrong... an old RCA composite video cable literally just combines the luminance and sync signals together, maybe you can?
 
It looks like how they combine it on the Millipede board is they run it through a chip then invert the output through another chip.... then when it gets to the Matsushita there is an IC that has a circuit inside it called the "Sync Seperator".
 
Back
Top Bottom