how to overclock your sega genesis model 1 and NOTHING ELSE

[Thunderblaze16]

Good news, I learned how to overclock the model 1 genesis!

Honestly I got tired of seeing people not just talking about overclocking the Sega Genesis model 1 but seeing them including things and mixing the mod with other mods using these little boards in there guides that just makes the mod so confusing.

So I well show you how to overclock your Sega Genesis with an 10Mhz 4 Pin Oscillator, JUST talking about the overclock situation and NOTHING ELSE.

Here's the video I made explaining how in my new YouTube channel :P


This video takes you on each step in how to overclock your Sega Genesis model - 1.
7/31/13 UPDATE!


Tools you well need,

-Drill/dremel
-Screwdriver
-Cables (Highly recommend 28 gauge cables for better handle. You can find the same wires I used here,)
http://www.ebay.com/itm/15ft-14-Way-...item3ce545dfe5
http://www.jameco.com/webapp/wcs/sto...0001_639672_-1
-10Mhz 4 Pin Oscillator
-Vero Board (if you wanna have the oscillator REALLY secure)
-SPDT Toggle Switch: 2 Position: ON-ON (I got mind from here,)
http://console5.com/store/spdt-toggl...ion-on-on.html

11/18/12 UPDATE!

Here you go guys, a simpler demonstration display on how to overclock your Sega Mega Drive model 1.



Remember to use less than 4 inches of wire for this mod cause more than that much wire can result in some corruption and screen freezing.


So first using your screwdriver, open up your Sega Genesis from below by removing the 6 screws and then remove the screws that are holding down the top metal shield plate. Make sure to keep track of the screws you remove.
With the top shell of your Sega Genesis, using your drill or dremel. Locate the desired area you want to set the toggle switch in the top shell and make the proper hole size to which the toggle switch can fit in with no struggle.




Now you wanna lift up pin 15. Notice in the pic, pin 15 is lifted up and had a red wire soldier to it and there's a brown wire where pin 15 use to be connected that we soldier on there so we can have the choice to get the regular overclock speed back.



(YOU WANT TO BE ABLE TO SWITCH BACK TO YOUR REGULAR CLOCK SPEED CAUSE YOU WON'T BE ABLE TO PLAY YOUR SEGA CD AND 32X WITH IT OVERCLOCK)

The red wire soldier in the lifted up pin 15 goes to the CENTER of the toggle switch, The brown wire that's been soldier under the metal that pin 15 use to be connected to is now soldier to one side of the toggle switch. (you can put your regular mhz and 10 mhz to whichever side of the toggle Switch).


Now with the 10Mhz 4 Pin Oscillator, find the spike that's sticking out from one of the corners, that spike well indicate what's what, making it easier to know which corner does what.


Here is the bottom of the 10Mhz 4 Pin Oscillator, blue cable carries vcc, yellow carries gnd and green carries the new clockspeed.



Remember,+5v on the plus side of any capacitor on the board and ground on the negative side of any capacitor. (the Oscillator requires both of them). There's other areas where you can get +5v & ground, but these are the easiest ones to use.



Now after soldiering the wires to the 2 legs of the oscillator, (+5v & GND) to there proper areas on the Sega Genesis board, carefully soldier a wire to the leg of the oscillator that carries your new clock speed and soldier other side of that same wire to the toggle switch that wasn't taken from your regular clock speed wire that we talked about in the begging.

(REMEMBER, ANY SIDE ON THE TOGGLE SWITCH FOR THE CABLES CARRYING YOUR NEW AND OLD CLOCKSPEED EXCEPT THE MIDDLE LEG OF THE TOGGLE SWITCH) [/B]



and DONE!, nothing else.











NOW FOR THE OPTIONAL HALT SWITCH

The halt switch is optional, it just lets you stop the game to switch your clock speeds without having the game to crash, its also handy as a pause feature for your genesis. You don't really need it, but if you DO want the halt switch, please follow the following diagram, (its pretty simple really).

-DOES NOT REQUIRE LIFTING UP THE PIN 17 LEG-


So in the image below, I soldered an orange cable to pin 17 leg. The other side of this orange cable well be soldered to the toggle switch.


This other cable that is yellow, has been soldered to an area that carries gnd or as shown in the picture, the negative leg of a capacitor. The other end of this same cable well be soldered to the the other side of the toggle switch. Don't solder any of the 2 cables in the middle leg of the toggle switch as this well not allow the halt to work.




Screw your system back close with the screws you removed and done!




Big thanks to demomonster and his review of it, which is where I learned about this mod.






For more Sega Genesis model - 1 modding tutorials, please visit the following link below.
http://www.sega-16.com/forum/showthr...ding-Tutorials

[Lastcallhall]

The title of this thread made me think of this:

[kool kitty89]

I forget if this has been addressed before, but do many things work if you use a fixed (no switch) overclock (booting overclocked), or does that have problems in practice? (I did a test with that on one of my signetics 68k boards and it seemed to work, but had odd I/O issues -kept pressing start every few seconds- though that may be due to the chipset used on some Signetics motherboards -it might do the same thing with a switch installed, I haven't tested that . . . and may not bother anyway as I've got a motorola VA5/6 and hitachi CMOS VA6.8 to work with too)

[Bastardcat]

Whats the purpose of overclocking a dedicated console?

[Thunderblaze16]

I forget if this has been addressed before, but do many things work if you use a fixed (no switch) overclock (booting overclocked), or does that have problems in practice? (I did a test with that on one of my signetics 68k boards and it seemed to work, but had odd I/O issues -kept pressing start every few seconds- though that may be due to the chipset used on some Signetics motherboards -it might do the same thing with a switch installed, I haven't tested that . . . and may not bother anyway as I've got a motorola VA5/6 and hitachi CMOS VA6.8 to work with too)

you should know, that the Signetics are the worst ones to overclock, mostly due to the fact they were knock off boards sega used for a little time to save money but notice it was pretty shit. its good to stick with the motorola and its better to have a switch on your overclock genesis cause overclock doesn't let you play your 32x and sega cd games so the switch brings it back to normal and stopping that from happening. thought I still see no point for a halt switch lol.

[Lastcallhall]

you should know, that the Signetics are the worst ones to overclock, mostly due to the fact they were knock off boards sega used for a little time to save money but notice it was pretty shit. its good to stick with the motorola and its better to have a switch on your overclock genesis cause overclock doesn't let you play your 32x and sega cd games so the switch brings it back to normal and stopping that from happening. thought I still see no point for a halt switch lol.

Not at all true.

I've overclocked roughly a 50/50% mixture of Signetics and Motorola processors, each with their own independent set of pros and cons. What I mean is, is that I've bought groups of systems that all have a Signetics CPU and I was able to overclock one machine with a 12 MHz overclock, when - using the same contact points, cables (and cable lengths), and oscillators I'm only able to overclock an identical system up to 10 MHz without it not working on me (locking up when enabled seems to be the most common fault; although I have had issues with the "start" button acting up). I can even take the failed OC board, take out the 12 MHz clock, pop in a 10 MHz clock, reconnect it to the Genesis, and it works like a champ. Same thing with Motorola processors. I'm willing to bet the Signetics issue was created by a modder who just got unlucky with the processor brand and labeled it as "unclockable." The reasoning for this probably has to do, like Chilly Willy said, the chipset used in conjunction with the processor. I haven't researched enough (or cared enough, really - 10 MHz is fine for most games)to find an absolute answer.

As far as the hard set overclock, certain games will not work with the OC on, but that's to be expected. Where the halt switch comes in, at least from my experience, is when you use an Everdrive. In order to select the "Select Game" option from the menu and have it work, you NEED to have the Genesis running at stock speed. Once the game is loaded, you can halt the system, overclock it, and resume play. Otherwise you have to select the game at stock speed, turn OFF the Genesis, turn the OC on, then turn the Genesis back on, select "Play Game (this option works in OC mode)" and play your game from there. I also like having one to view the difference between the system overclocked and at stock on the fly.

[Thunderblaze16]

Not at all true.

I've overclocked roughly a 50/50% mixture of Signetics and Motorola processors, each with their own independent set of pros and cons. What I mean is, is that I've bought groups of systems that all have a Signetics CPU and I was able to overclock one machine with a 12 MHz overclock, when - using the same contact points, cables (and cable lengths), and oscillators I'm only able to overclock an identical system up to 10 MHz without it not working on me (locking up when enabled seems to be the most common fault. I can even take the failed OC board, take out the 12 MHz clock, pop in a 10 MHz clock, reconnect it to the Genesis, and it works like a champ. Same thing with Motorola processors. I'm willing to bet the Signetics issue was created by a modder who just got unlucky with the processor brand and labeled it as "unclockable."

As far as the hard set overclock, certain games will not work with the OC on, but that's to be expected. Where the halt switch comes in, at least from my experience, is when you use an Everdrive. In order to select the "Select Game" option from the menu and have it work, you NEED to have the Genesis running at stock speed. Once the game is loaded, you can halt the system, overclock it, and resume play. Otherwise you have to select the game at stock speed, turn OFF the Genesis, turn the OC on, then turn the Genesis back on, select "Play Game (this option works in OC mode)" and play your game from there. I also like having one to view the difference between the system overclocked and at stock on the fly.

I just listen to my teacher, Demomonster, also I don't have an ever drive since I prefer collecting so I never had to deal with your type of problem lol, I well get one later on though, I do understand what your saying, I guess the halt switch wouldn't be to bad since it doesn't really require much.

P.S. what did you think of my explanation of how to overclock in this thread? was it accurate?

[Lastcallhall]

Looks good.

[Thunderblaze16]

one quick thing, you know how I'm using a switch with 3 metal bars sticking out from the back? well in this diagram,



dudes using only 2 sides, so, do I just ignore the middle side for this halt mod?
and do I have to lift the pin for this one to or just soldier it from where its at?

[Lastcallhall]

That's an on-off switch in the diagram. What you're using for the overclock is an on-on switch (or it could be an on-off-on; I always confuse the two). The point is, is that to create a halt switch, you need a switch that has a dedicated "off" position. I suppose you could take a SPDT switch and wire it up where two of the three prongs are ground, and the other is the halt signal - that should work.

Oh, you definitely do NOT want to lift pin 17 for this. Leave it connected to the system board.

[Guntz]

From my short exposure to switches, when a specific type of switch is needed (like say SPST On - On), you NEED that specific switch. Nothing else will work. One mod needed a DPST on - on switch. I got one but it turned out to be on - off, so it was missing two out of the six poles. I was told that switch will not work. The DPST on - on switch is required and has no substitute.

[Thunderblaze16]

gonna need you to post all these switches with images

[Guntz]

Pictures is unfortunately, something I cannot find. I can provide links though.

The following switch I was told, will work as a CPU halt switch. If you note, it is SPST, On - Off and it likely only has two poles. It's also super cheap.

http://ca.mouser.com/Search/ProductD...R13-112A-02-EV

[Lastcallhall]

I'm with Guntz on this one, as this is the type I use for my halt switches.

[retrogamer343]

For a halt switch I just use a simple momentary push button. Press for on (connects ground to pin 17 and halts the system) let go to resume. They are very cheap at radio shack.