Gensis Jumpers thread READ!!

[MEGADRIVE Jeroi]

Hello. I have made now countles single switch mods and I have came to see that if I go the way all sites in the world says that JP1-2 are Languake and JP3-4 is HZ then the switch dont work right. Lets say if my green cable (pal) is connected to JP4 I will get JAPAN region when green is giving gnd. SoI must always connect green to JP2 and red to jp4 to optain the right result where Green is providng gnd it is reagion pal, and when red is providing gnd it is JAP.

So here is actual jumper settings of megadrive:

JP1 gnd - o
JP2 +5 - o = HZ <- here I connect green and when green is providing gnd it is pal

JP3 gnd - o
jp4 +5 - o = Language <- here I connect red and when gns console is jap.


Have anyone else noticed while modding that actually genesis HZ are JP1-2 and Language is JP3-4?

[Jorge Nuno]

JP1 is Japan, JP2 is Exp, JP3 is PAL, JP4 is NTSC, the schematics prove it and I've verified this myself. You have done something wrong to conclude that :|

[Lastcallhall]

There's no way that's correct. Here's a quick mock up:

http://img.photobucket.com/albums/v445/lastcallhall/switches.jpg

Jorge Nuno is right JP1= Japan JP2 = English JP3 = PAL & JP4 = NTSC. Green is switch up, red is switch down. The only way that changes is if you use JP 1 and JP3 as the common point instead of JP 2 and JP4.

[MEGADRIVE Jeroi]

http://www.sega-16.com/forum/showpost.php?p=336985&postcount=3

Hers is proof, I have noticed wiht md2 too also that the asic pins are not acting same. Actually 107 is hz and 46 is language. Atleast when I wire like in that thread, I get pal when green, japan when red.

I just double checked and yes, that picture has left is green right is red and left is pal, right is jap and aas you see from pictures,green goes to Jp2 and red goes to JP4.

I also just checked with univreasal power adapter that green pin is actually the shorter outer pin of the led and red is longer so there is no mistake also.

I have modded 3 md2's thinking that asic pin 46 is hz and scarthich my head of figurin why green cable dont provide 60hz but instead JAP region. And HAve figured out that if I add green to 107 and provide GND then I get HZ switch to PAL.

Also tonight I made a multimega LED mod also and it behaved the same, When providing with green gnd to jp2 then I have pal, when providing gnd to JP4 then it is JAP. Theres no mistake, I tried like 4 times which way the cables work that pal is left and green light and no mistake, green goes in multimega also to jp2 with green light and console is pal. That makes JP1-2 actaully the HZ and JP3-4 region.

[Jorge Nuno]

WHAT!? PAL when green, JAP when red? WTF does this mean -__-

[Lastcallhall]

It's a multi colored LED setup, which the OP failed to mention in his original post.

Back on topic, the jumper settings are set in stone - I'm not sure why your LED is reading out differently. I'd try using the alternative common points than the ones you're currently using.

[Jorge Nuno]

Ok, when the LED is green, the red wire (JP3/4) is connected to ground, so its PAL mode.

When its red, the green wire (JP1/2) is connected to ground, and causes the MD to go into JAP mode.

When its orange/yellow/whatever, both wires are at the high level (NTSC+En).


This is consistent with our data, there is no swap whatsoever.

[MEGADRIVE Jeroi]

Ok, when the LED is green, the red wire (JP3/4) is connected to ground, so its PAL mode.

When its red, the green wire (JP1/2) is connected to ground, and causes the MD to go into JAP mode.

When its orange/yellow/whatever, both wires are at the high level (NTSC+En).


This is consistent with our data, there is no swap whatsoever.

If JP3-4 are HZ then why the hell I have all these problmes when trying to provide gnd to jp3-4 and it changes JAPAN. Just look images, when I switch to left(green) green goes to JP1-2 switchin JP1-2 to GND and console is PAL. I am not shitting you guys.

I have triple checked my solderings and yes, Green goes to left pin on the switch, pal is left on the switch, green goes to restior on the JP1-2. How ever, my led wiring must be worng because when providing gnd to green cable, then LED should be red. So My LED connector is upside down I guess but hey it works.

And I just opened my MD1 to check it once more fully opened. I dont know what the hell is going on, because green cable goes to left on the switch, it goes to jp2 resitor that provides more voltage to +5 rail for leds, then green goes to LED GREEN the shorter outer PIN and it shines GREEN!!!!!!!

WTF is going on?

Is the shorter pin of the led RED? that would explain the color. But it dont explain why provond ground with Green to JP1-2 makes console to PAL? This same situation I have with all consoles, MD1, MD2, Multimega, all of them changes HZ from JP1-2. And believe me, I just made a SLMOD to multimega and I opened 5 TIMES the console to get the colors and Regions working the way I want and for fuck sake the green is again providing PAL region on JP1-2, not Jp3-4.

If some one has Un modded console, try to check if JP1-2 provides you PAL 50HZ if inputting gnd instead US +5.

[Jorge Nuno]

Ok, when the LED is green, the red wire (JP3/4) is connected to ground, so its PAL mode.
(...)


Exept if you look carefully enough the green cable is in JP2 not jp3-4.

Im talking about the green lit LED and red wire.

If LED = green then the red wire is grounded, the red wire connects to 3/4, and ground on these set of jumpers = PAL.

[MEGADRIVE Jeroi]

Im talking about the green lit LED and red wire.

If LED = green then the red wire is grounded, the red wire connects to 3/4, and ground on these set of jumpers = PAL.

I cheked led schemas and shorter pin is RED anode and mygreen cable is conneced to RED anode which does this that Green light shows when Pal is grounded.

How ever, as I said dont focus on the leds, As you see from pictures, that switch is left it is pal, Green grounded and green goes to JP1-2. This makes JP1-2 HZ switch. And those resitors just provide enough voltage for leds so dont allow them to mix your head.

Also tomorrow I will make SLMOD for MD2 and I report here the results: which asic pin makes console to PAL or JP.

[Jorge Nuno]

Gezz what a mess.

This circuit is really simple, I know this shit, beleive me.

I know the resistors are for lighting the leds, otherwise there isn't enough current from the weak internal chip pullups. So we have this switch, which is connected to side A, side B, or opened (center).

On the center terminal there is a ground wire. By flipping the switch to either side, youre connecting JP1/2 to ground, or JP3/4 to ground, or nothing.


Continuing, and forgetting about the LED.

When the switch is on the "EU" position, the opposite red wire terminal gets in contact with the center terminal, causing the JP3/4 going to 0V. 0V here means PAL.

On the JP position, the green wire gets connected to ground.

When you toggle the switch to a side, its the opposite side that gets connected.

[MEGADRIVE Jeroi]

Gezz what a mess.

This circuit is really simple, I know this shit, beleive me.

I know the resistors are for lighting the leds, otherwise there isn't enough current from the weak internal chip pullups. So we have this switch, which is connected to side A, side B, or opened (center).

On the center terminal there is a ground wire. By flipping the switch to either side, youre connecting JP1/2 to ground, or JP3/4 to ground, or nothing.


Continuing, and forgetting about the LED.

When the switch is on the "EU" position, the opposite red wire terminal gets in contact with the center terminal, causing the JP3/4 going to 0V. 0V here means PAL.

On the JP position, the green wire gets connected to ground.

When you toggle the switch to a side, its the opposite side that gets connected.

Yes, that would be true, if jp3-4 is HZ. But as I have told, I now 6 times checked the machines MD1, MD2, Multimega and even the MD1 one in the pictures is here in front of me and beleve me: The console is in PAL, when I change Green to gnd, and green goes to JP1-2. I am not fooling you. I will take a picture.

[MEGADRIVE Jeroi]

There's no way that's correct. Here's a quick mock up:

http://img.photobucket.com/albums/v445/lastcallhall/switches.jpg

Jorge Nuno is right JP1= Japan JP2 = English JP3 = PAL & JP4 = NTSC. Green is switch up, red is switch down. The only way that changes is if you use JP 1 and JP3 as the common point instead of JP 2 and JP4.

Hah, I have written countles times tyhat jumpers I olike this:

http://www.sega-16.com/forum/attachment.php?attachmentid=1910&stc=1&d=1296302059

Actually you can connect any gnd or +5 on the mobo to those asic pins to change the console region. No need of using these JP gnd +5 sources.

Could this problem be because I have PAL region console. Would PAL consoles have had changed asic pins for regions and cousing my issues with pal machines when modding HZ switch?

[Jorge Nuno]

When the switch is on the "PAL" position it is not the green wire that is connected to gnd, its the red.
Just remove the switch and test the wires individually :bang:

And the jumpers don't look like that, unless youre viewing the board upside down...
And those pin numbers dont apply to MD1 boards less than VA7 or some MD2 revs and none of the GenIII

[MEGADRIVE Jeroi]

Ok you were right, the switch dont connect green to gnd when witch is green side. It actually connects red and gnd from oppsite side.