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Author Topic: Making SEGA Genesis cartridges  (Read 23198 times)

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pbj

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Re: Making SEGA Genesis cartridges
« Reply #200 on: May 30, 2023, 06:26:48 pm »
thats hilarious, i do the opposite... i use my game genie to plug in curved SFC games to my square ass console. i could mod it to take them, but i'm lazy

It's literally snapping off two pegs on the inside of the cart slot.  I believe in you. 

My rational was $30 for Super Famicom, or $65 for SNES.  SNES Game Genie was bought in a ~$15 lot with the Genesis one I actually wanted.  I honestly didn't even know if it worked until yesterday.  Super Famicom uses a stupid center negative power supply, but it's a common plug size.  I just cracked open a 9V 1A power supply from the junk pile and reversed the polarity.  Already had the AV cable and controllers.  I don't know if it's awesome or sad that I have all the accessories for 30 year old consoles laying around and can buy loose consoles and be fine... but here I am.

Thanks for the help, Yeah I believe it to be easier to just get the right ones. Do you have a suggestion on where to buy or is ebay the best option?

Well, how many is a "ton?"  It might be fun to program a chip and run a bunch of jumper wires.... once.

I get my EPROMs off AliExpress.  Last order was ~$35 shipped for 50 x 2MB (27C160) that I received last week.  It's been a total crap shoot with the quality.  Latest batch was actually shipped in antistatic sleeves of 5 chips and they're very clean.  I've burned 2 and they're fine so far.  I've had other batches where they've been thrown haphazardly into a bubble mailer.  Others have been stacks of ten neatly shrink wrapped.  The poorly shipped batch was actually mostly fine once I patiently straightened the legs.  One of the nice looking batches was about 30% useless.  Just embrace that all of this is a waste of money.  Don't bother with buying smaller than 2MB EPROMs because it's just a matter of pulling 2 pins high if you're using a 40 pin PCB and they're all the same price.


 :cheers:

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #201 on: May 31, 2023, 06:10:34 pm »
I have a couple hundred probably. Yeah its a waste of money because i have a mega everdrive pro. But I like tinkering with stuff especially modding consoles and soldering etc. Keeps my soldering skills up to date. lol

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Re: Making SEGA Genesis cartridges
« Reply #202 on: May 31, 2023, 08:05:01 pm »
What's not to love about nostalgia hoarding that pays off?!  :applaud:
If I didn't have a workshop 100 meters from the house to hide ---steaming pile of meadow muffin--- in I would probably get kicked out by the missus.

thats hilarious, i do the opposite... i use my game genie to plug in curved SFC games to my square ass console. i could mod it to take them, but i'm lazy

It's literally snapping off two pegs on the inside of the cart slot.  I believe in you. 

My rational was $30 for Super Famicom, or $65 for SNES.  SNES Game Genie was bought in a ~$15 lot with the Genesis one I actually wanted.  I honestly didn't even know if it worked until yesterday.  Super Famicom uses a stupid center negative power supply, but it's a common plug size.  I just cracked open a 9V 1A power supply from the junk pile and reversed the polarity.  Already had the AV cable and controllers.  I don't know if it's awesome or sad that I have all the accessories for 30 year old consoles laying around and can buy loose consoles and be fine... but here I am.

Thanks for the help, Yeah I believe it to be easier to just get the right ones. Do you have a suggestion on where to buy or is ebay the best option?

Well, how many is a "ton?"  It might be fun to program a chip and run a bunch of jumper wires.... once.

I get my EPROMs off AliExpress.  Last order was ~$35 shipped for 50 x 2MB (27C160) that I received last week.  It's been a total crap shoot with the quality.  Latest batch was actually shipped in antistatic sleeves of 5 chips and they're very clean.  I've burned 2 and they're fine so far.  I've had other batches where they've been thrown haphazardly into a bubble mailer.  Others have been stacks of ten neatly shrink wrapped.  The poorly shipped batch was actually mostly fine once I patiently straightened the legs.  One of the nice looking batches was about 30% useless.  Just embrace that all of this is a waste of money.  Don't bother with buying smaller than 2MB EPROMs because it's just a matter of pulling 2 pins high if you're using a 40 pin PCB and they're all the same price.


 :cheers:
Relax, all right? My old man is a television repairman, he's got this ultimate set of tools! I can fix it.

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #203 on: June 06, 2023, 11:34:02 pm »
I considered a pi and a Kade and chose otherwise.  We are into retro gaming because it is expensive and inconvenient.

 :lol
Could you highlight the areas you had to cut on the back? Or let me know if the circled areas I have are correct. Im trying this with madden 93 and just want to make sure im cutting the correct places?
« Last Edit: June 06, 2023, 11:41:49 pm by bulldawg »

pbj

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Re: Making SEGA Genesis cartridges
« Reply #204 on: June 07, 2023, 12:44:02 pm »
Your circles look correct.  I really, really suggest you try desoldering the Madden ROM before you spend too much time on that PCB.  It was taking me literally hours to pull parts off of them versus entirely stripping a SEGA PCB within 5 minutes.  If you come up with a quicker method for the EA boards, I would love to hear it.

 :cheers:


bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #205 on: June 07, 2023, 05:42:22 pm »
I already got the chip removed and installed a socket. Verified it still works with original chip (madden 93). I ending buying about 10 ea sports games because they were cheap. Took me about 30 mins. to desolder original chip and install socket. I used this desoldering iron in the pic and go through all the pins and the pins that didn't come clean the first go round (about 6 pins) I resoldered them with flux and got them clean the second time.

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #206 on: June 08, 2023, 09:09:02 pm »
Actually I was wrong I haven't opened madden 93 yet, It was nhl 93 and its 40 pins. The board layout looked the same at first glance. Now have to figure out how to mod this pcb.

Mike A

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Re: Making SEGA Genesis cartridges
« Reply #207 on: June 09, 2023, 07:12:29 am »
Now there are two of you.

I love it.

Keep posting.

pbj

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Re: Making SEGA Genesis cartridges
« Reply #208 on: June 09, 2023, 06:27:47 pm »
Actually I was wrong I haven't opened madden 93 yet, It was nhl 93 and its 40 pins. The board layout looked the same at first glance. Now have to figure out how to mod this pcb.

I'm curious.  Are you in a 220V country?  I've looked at that type of iron and heard they don't work as well on 110V.  Should have just gone ahead and bought one, would have saved me a ton of time apparently.  I think I've mentioned previously that there was one era of EA cartridges manufactured in Puerto Rico that had really soft solder.  So soft you can just pull the chips off with a flathead screwdriver.  Other people have told me that they have no problem whatever with EA cartridges, so I'm still not sure what to make of it.  I can desolder SEGA PCBs so cleanly that the chips fall off with gravity.

 :dunno

For the 40 pin PCBs, just burn a 512Kb game, bend up legs 1 and 42, and then tie those two legs to 5V.  I don't recommend running jumper wires to the cartridge edge connector.  I did it and screwed up my female connector on my Genesis motherboard.  That was before I was using Kynar wire, though.

Anyway, Malenko and I have made an enormous library of Genesis cartridge labels suitable for printing.  It's his google drive so his call if he wants to post it publicly.

 :cheers:


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Re: Making SEGA Genesis cartridges
« Reply #209 on: June 09, 2023, 06:32:37 pm »
Anyway, Malenko and I (mostly Malenko) have made an enormous library of Genesis cartridge labels suitable for printing.  It's his google drive so his call if he wants to post it publicly.
FTFY
https://drive.google.com/drive/folders/1tVZb-Crq0XpU-4xo4HXjcYyn5VgqTLa-?usp=sharing

they arent perfect, some are super custom.
If you're replying to a troll you are part of the problem.
I also need to follow this advice. Ignore or report, don't reply.

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #210 on: June 10, 2023, 12:03:38 am »
Actually I was wrong I haven't opened madden 93 yet, It was nhl 93 and its 40 pins. The board layout looked the same at first glance. Now have to figure out how to mod this pcb.

I'm curious.  Are you in a 220V country?  I've looked at that type of iron and heard they don't work as well on 110V.  Should have just gone ahead and bought one, would have saved me a ton of time apparently.  I think I've mentioned previously that there was one era of EA cartridges manufactured in Puerto Rico that had really soft solder.  So soft you can just pull the chips off with a flathead screwdriver.  Other people have told me that they have no problem whatever with EA cartridges, so I'm still not sure what to make of it.  I can desolder SEGA PCBs so cleanly that the chips fall off with gravity.

 :dunno

For the 40 pin PCBs, just burn a 512Kb game, bend up legs 1 and 42, and then tie those two legs to 5V.  I don't recommend running jumper wires to the cartridge edge connector.  I did it and screwed up my female connector on my Genesis motherboard.  That was before I was using Kynar wire, though.

Anyway, Malenko and I have made an enormous library of Genesis cartridge labels suitable for printing.  It's his google drive so his call if he wants to post it publicly.

 :cheers:

Im in the US, so 110v. I actually have a 40 pin m27c4002 eprom burned and it does not work. Don't know if its the chip or if I need to mod the pcb. Figured with them being 40 pins and same size it would work without mods but no. I burned the the same image to a 42 pin 2mb rom and put in a 42 pin 2mb cart and it works. All the ones I've desoldered so far are assembled in the usa.
« Last Edit: June 10, 2023, 12:08:49 am by bulldawg »

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #211 on: June 10, 2023, 12:04:18 am »
Anyway, Malenko and I (mostly Malenko) have made an enormous library of Genesis cartridge labels suitable for printing.  It's his google drive so his call if he wants to post it publicly.
FTFY
https://drive.google.com/drive/folders/1tVZb-Crq0XpU-4xo4HXjcYyn5VgqTLa-?usp=sharing

they arent perfect, some are super custom.
Thanks for sharing.

pbj

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Re: Making SEGA Genesis cartridges
« Reply #212 on: June 10, 2023, 06:57:13 am »
Did you swap the bytes?

https://www.romhacking.net/utilities/1621/

Also check the unswapped rom in Kega Fusion first and make sure you donít get error messages.

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Re: Making SEGA Genesis cartridges
« Reply #213 on: June 11, 2023, 05:40:30 pm »
Lighter fluid is $1.50 here for a 32oz bottle.  I have 4oz in that plastic food tub and so far Iíve removed six labels.  Put the lid back on and it doesnít evaporate.  Iím good.

Labels are printed on a color laser on full sheet mailing labels.  I can get six per sheet and have enough room to make EPROM labels.  The sheets are 10 cents each.

Hereís a 42 pin 2MB eprom running a half megabyte game on a 40 pin pcb.  Legs 1 and 42 are bent up and tied to ground.  Works perfectly.

 :cheers:
How to get a 42 pin 2MB eprom running on a 512mb 42 pin pcb?

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #214 on: June 11, 2023, 05:48:54 pm »
Did you swap the bytes?

https://www.romhacking.net/utilities/1621/

Also check the unswapped rom in Kega Fusion first and make sure you donít get error messages.
Yep byte swap and checked in kega.

pbj

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Re: Making SEGA Genesis cartridges
« Reply #215 on: June 11, 2023, 06:22:19 pm »
What rom are you trying to run?  If itís 512Kb, you bend up eprom pins 1 and 42 and jump them to 5V.  If itís 1MB or 2MB, follow my pic from the first page of this thread showing which pins on the edge connector need what.  Tell me the game and Iíll play along.

 :cheers:

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Re: Making SEGA Genesis cartridges
« Reply #216 on: June 11, 2023, 07:49:20 pm »
Golden axe 2 on a 2mb 42 pin eprom. Donor pcb is RBI 93 42 pin 512kb pcb. So even if its 42 pin pcb still bend first 2 legs?
« Last Edit: June 11, 2023, 07:51:01 pm by bulldawg »

pbj

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Re: Making SEGA Genesis cartridges
« Reply #217 on: June 11, 2023, 09:02:33 pm »
NoÖ noÖ. Only bend the legs if the PCB is 40 pin.

Iím almost positive I have one of those RBI boards laying around.  Iíll convert to Golden Axe 2 and take pictures.


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Re: Making SEGA Genesis cartridges
« Reply #218 on: June 12, 2023, 09:08:10 am »
Are you using M27C400 or M274002?  4002 has the wrong pin out. 

Okay, assuming that you're using M27C400 and your PCB is the same as pictured here:



(found on this page:  https://www.pricecharting.com/game/sega-genesis/rbi-baseball-93 )

Pin 1 on the ROM is running to B7.  Pin 42 is being pulled high to 5V.  Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a jumper wire from pin 42 to B8 on the edge connector.  That will tell the Genesis it's a 2MB EPROM.

 

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Re: Making SEGA Genesis cartridges
« Reply #219 on: June 12, 2023, 09:33:00 am »
Are you using M27C400 or M274002?  4002 has the wrong pin out. 

Okay, assuming that you're using M27C400 and your PCB is the same as pictured here:



(found on this page:  https://www.pricecharting.com/game/sega-genesis/rbi-baseball-93 )

Pin 1 on the ROM is running to B7.  Pin 42 is being pulled high to 5V.  Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a jumper wire from pin 42 to B8 on the edge connector.  That will tell the Genesis it's a 2MB EPROM.
Im using m27c160 on this one. I should have mentioned this is different from the other one I was working on. But that would make sense why the other board is not working being 4002 is different pinout.

pbj

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Re: Making SEGA Genesis cartridges
« Reply #220 on: June 12, 2023, 02:42:16 pm »
I've read that the only difference between an EPROM and OTP ROM is the quartz window.  If you can somehow expose the internals, you can erase a OTP.




I tried my soldering iron at 900 degrees and couldn't cut through the housing. 

Tried the dremel on another chip.  It exposed the internals but I think went a little too far.   :-\



Still working on a process... surely something will eat away the housing gently.   :dunno


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Re: Making SEGA Genesis cartridges
« Reply #221 on: June 12, 2023, 05:02:56 pm »
Are you using M27C400 or M274002?  4002 has the wrong pin out. 

Okay, assuming that you're using M27C400 and your PCB is the same as pictured here:



(found on this page:  https://www.pricecharting.com/game/sega-genesis/rbi-baseball-93 )

Pin 1 on the ROM is running to B7.  Pin 42 is being pulled high to 5V.  Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a jumper wire from pin 42 to B8 on the edge connector.  That will tell the Genesis it's a 2MB EPROM.
Well this one is going to be a no go. I was redoing my connection from pin 42 to b8 and the pad lifted up. Oh well. Thanks anyway.

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Re: Making SEGA Genesis cartridges
« Reply #222 on: June 12, 2023, 05:29:02 pm »
Put a jumper wire on pin 42 and try it pulled to ground and see if it boots.  If it doesn't, tie it back to 5V.  If that doesn't work, tie pins 1 and 42 together, and then try 5V and then ground.  One of those combinations will make it work.

If you have 42 pin holes on the PCB, there's no need to lift legs, but you may have to cut traces to properly isolate the pins before you add the jumper wires.


Here's a Forgotten Worlds (512Kb ROM) on a 40 pin PCB burned to a 2MB 42 pin EPROM.  I've lifted legs 1 and 42, jumped them together, and jumped to the 5V on the back of the PCB.




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Re: Making SEGA Genesis cartridges
« Reply #223 on: June 12, 2023, 07:57:12 pm »
Put a jumper wire on pin 42 and try it pulled to ground and see if it boots.  If it doesn't, tie it back to 5V.  If that doesn't work, tie pins 1 and 42 together, and then try 5V and then ground.  One of those combinations will make it work.

If you have 42 pin holes on the PCB, there's no need to lift legs, but you may have to cut traces to properly isolate the pins before you add the jumper wires.


Here's a Forgotten Worlds (512Kb ROM) on a 40 pin PCB burned to a 2MB 42 pin EPROM.  I've lifted legs 1 and 42, jumped them together, and jumped to the 5V on the back of the PCB.


Pin 42 to ground worked. Thanks alot.

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Re: Making SEGA Genesis cartridges
« Reply #224 on: June 12, 2023, 08:05:17 pm »
Where are you picking up 5v from? That might be what I need to fix that other pcb. The 40 pin one I have.

pbj

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Re: Making SEGA Genesis cartridges
« Reply #225 on: June 12, 2023, 10:25:33 pm »
Yellow is a hypothetical jumper from pin 42 to 5V.  Blue is a jumper to ground.  Some games/chips work with one, some with the other.  Try both.


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Re: Making SEGA Genesis cartridges
« Reply #226 on: June 12, 2023, 10:54:26 pm »
So pin 1 and 42 to 5v no go, but both to ground and I get the sega screen followed by a red screen. So some progress. This is the 40 pin nhl 93 pcb with the trace cuts and jumpers. Also just to note I have a socket installed and the legs are down but not touching pcb. I have tmnt hsh 1 mb image on 2mb eeprom.
« Last Edit: June 12, 2023, 10:58:22 pm by bulldawg »

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Re: Making SEGA Genesis cartridges
« Reply #227 on: June 12, 2023, 11:05:59 pm »
Cut the traces above A8 and A9 above your jumper wires.  You donít want them connecting to any of the SRAM stuff.

If that doesnít do it, reflow your socket connections.  Particularly top row towards the middle.

Youíre positive the checksum is correct?  Red screen is usually checksum error.

Youíre close.

 :cheers:

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Re: Making SEGA Genesis cartridges
« Reply #228 on: June 12, 2023, 11:20:26 pm »
Cut the traces above A8 and A9 above your jumper wires.  You donít want them connecting to any of the SRAM stuff.

If that doesnít do it, reflow your socket connections.  Particularly top row towards the middle.

Youíre positive the checksum is correct?  Red screen is usually checksum error.

Youíre close.

 :cheers:
So I cut the traces above a8 and a9, I checked all the pins for continuity and all good and I dumped the rom and test in kega and it works but still no go.

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Re: Making SEGA Genesis cartridges
« Reply #229 on: June 12, 2023, 11:23:38 pm »
Open the rom header on the rom suite program and make sure it matches.  I can post a pic tomorrow.  Or just email it to me and Iíll test. (Pinballjim at hotmail dot com)


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Re: Making SEGA Genesis cartridges
« Reply #230 on: June 13, 2023, 10:57:06 am »
you wonna try SNES games next? they are super easy! :P ive done about 2 dozen games. same same, remove rom, burn a new one byte swapped... couple jumpers to swap 2 legs, and done.

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Re: Making SEGA Genesis cartridges
« Reply #231 on: June 13, 2023, 11:16:02 am »
Through a combination of work incentives and class action lawsuit payouts, I managed to pick up an SD2SNES for about $40 out of pocket.  That has instant loading, save state support, etc etc.  Should be here by the end of the week.

I also don't really feel the urge to do the SNES thing like I did Genesis, and you get into complications like buying expensive donor cartridges or making new expensive blanks.  Star Fox 2 is slightly tempting, but even that's gonna be about $20-30 each and you have to snuff another game to do it.  I've got a few tire kickers on that one but nobody's committing.  I see people selling those for ~$60 and frankly that's probably worth it if you want one.





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Re: Making SEGA Genesis cartridges
« Reply #232 on: June 13, 2023, 11:35:49 am »
I managed to pick up an SD2SNES for about $40 out of pocket.

i would buy one of those carts if they didn't want 225 bucks for the latest everdrive "FXpak pro" version ones... and 199 for the n64 one to while i was at it.

that said i've probably spent over 200 bucks on used carts and roms to make the ones i have now. c'est la vie  :dunno

pbj

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Re: Making SEGA Genesis cartridges
« Reply #233 on: June 13, 2023, 01:00:03 pm »
$105 for a Chinese version.  Itís not even a bootleg as it was all open source.

 :cheers:

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #234 on: June 24, 2023, 12:16:04 am »
Open the rom header on the rom suite program and make sure it matches.  I can post a pic tomorrow.  Or just email it to me and Iíll test. (Pinballjim at hotmail dot com)
So I burned another eprom with your image and still no go. But I tried that rom in another donor pcb and it worked. Something else im missing on the first pcb.

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #235 on: June 24, 2023, 12:19:17 am »
On a side note this is all the ones I've been successful with thus far, except mk im waiting on m27c322 eproms.
« Last Edit: June 24, 2023, 12:22:49 am by bulldawg »

pbj

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Re: Making SEGA Genesis cartridges
« Reply #236 on: June 24, 2023, 05:41:07 pm »
I may actually cry a little.  I'm glad you got TMNT working.

Here's how I do my labels.  It took me dozens of attempts to work out this method.  You may consider it.  I've actually reprinted and replaced a bunch of mine.

First buy 100 full sheet mailing labels off the ebay for ~$15 and print six labels to a sheet:



(I like to use the leftover white space to make EPROM labels and also has a note in there about what sizes the SEGA/EA labels should be)


You can do this before or after the clearcoating, but peel the backing side and cut slits underneath where it rests on the labels.  Keeps you from nicking them up trying to peel them later.



Tape it to the vertical side of a cardboard box.  One misty coat so you don't make the ink run.  Wait an hour, give it a second coat.



Then cut them out as straight as you can manage.  Run a sharpie sideways along the sides.  You can see I've done about half this edge in this photo:



Here's the whole side done:



Then when you slap it on the shell, you don't have a white leading edge:



I've got a multicolor set of sharpies, so I use red/blue/orange/whatever as most closely matches the art.

 :cheers:

(and this is an extra Cave Story cartridge.  who wants it?  :P)

« Last Edit: June 24, 2023, 05:43:18 pm by pbj »

emphatic

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Re: Making SEGA Genesis cartridges
« Reply #237 on: June 25, 2023, 04:38:23 pm »
That's some next level label work.  :cheers:

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #238 on: July 07, 2023, 05:38:06 pm »
I may actually cry a little.  I'm glad you got TMNT working.

Here's how I do my labels.  It took me dozens of attempts to work out this method.  You may consider it.  I've actually reprinted and replaced a bunch of mine.

First buy 100 full sheet mailing labels off the ebay for ~$15 and print six labels to a sheet:



(I like to use the leftover white space to make EPROM labels and also has a note in there about what sizes the SEGA/EA labels should be)


You can do this before or after the clearcoating, but peel the backing side and cut slits underneath where it rests on the labels.  Keeps you from nicking them up trying to peel them later.



Tape it to the vertical side of a cardboard box.  One misty coat so you don't make the ink run.  Wait an hour, give it a second coat.



Then cut them out as straight as you can manage.  Run a sharpie sideways along the sides.  You can see I've done about half this edge in this photo:



Here's the whole side done:



Then when you slap it on the shell, you don't have a white leading edge:



I've got a multicolor set of sharpies, so I use red/blue/orange/whatever as most closely matches the art.

 :cheers:

(and this is an extra Cave Story cartridge.  who wants it?  :P)
That's some quality work.

bulldawg

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Re: Making SEGA Genesis cartridges
« Reply #239 on: July 07, 2023, 05:42:48 pm »
Got my m27c322 roms today and programmed Mortal Kombat arcade edition and it works until the end of round one and freezes. Donor Cart was nfl qb club 96 which is a 4mb cart and my rom is 4mb any ideas?
« Last Edit: July 07, 2023, 05:46:25 pm by bulldawg »