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NeoGeo Conversions for fun and (no) profit - Blazing Star complete/documented

i think the question is...
Is there a newer adapter to use with a memory format that doesn't cost too much and is easy to find?
We need it for both 64 mbit C roms and 32 mbit V roms.
Second question which programmer is compatible ? I have TL866 programmer.
Maybe https://www.buyicnow.com/ can help us ? :D

Are you still willing to do an Irritating maze?
Be careful that only the latest version of the recently fixed rom has good audio.
 
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Agree, for the really big games (MS3 and etc) will need 8x64Mbit.

Initially I had high hopes for something like this
https://www.buyicnow.com/it.php?i=169
But 3.3v signalling makes that impractical

About the only 5v flash I could find was this
https://www.buyicnow.com/it.php?i=527
Pinout is very tricky, well beyond my ability to make an adapter for

Unless an easy 64mbit solution presents itself I might refocus on the biggest game I can cram onto 32Mbit Eproms Pulstar, Metal Slug, Shock troopers, or Metal Slug 2)
 
We need more memory than 1 and a brend new adapter i think..
1720095256673.png


We need an elettronic wizard :sorry:
Who will help us for the glory of the king ? [neogeo]
 
Check this pretty adapter found on aliexpress conversion..

Metal-Slug-5-MVS-conversione-NEOGEO-Arcade-Game-Card-Retro-parti-di-gioco.jpg_.jpeg
 
Great news! It is theoretically possible (and also comically inconvenient) to flash W29GL064CB7S with the SPI interface on a Raspberry PI using https://github.com/flashrom/flashrom
This specific chip is entirely untested.
Untested, unreliable, and comically inconvenient - sounds like my kind of solution...
 
Check this work in progress from a user from facebook !
https://illusionrip.com/2024/05/proto-vrom-pour-cartouche-neo-geo-aes-et-mvs.html
1720544307329.png
Click to expand...
Hi all,
I reviewed my copy regarding the replacement of Neo Geo Vroms on AES/MVS cartridges
This is a replacement ROM for the sound ROMs of large capacity cartridges
the first 2-layer prototype works but some samples have saturation problems on certain signals
the new eprom works at 3.3V, and the Neo at 5V (signal measurement showed 4.3v)
the new eprom was given with a tolerance of +1V on the signals
but I haven't measured all the signals and I think there must be signals higher
so I added level shifters (4) and a 5V-->3.3V voltage converter, and decoupling capacitors, I also brought the high-order data lines to a pull down with a 10k resistor
I also inserted mezzanine pins to have more places for routing
In short, that's a lot more people, so I had to try the joy of the 4-layer prototype
Click to expand...
https://www.facebook.com/groups/501716767164818/user/100009403501158/

450216873_3851366038520142_7872404294642325353_n.jpg

450197670_3851366125186800_6355308257614989849_n.jpg
 
Oh interesting. Guess this could work for building a Neotris cart?

twistedsymphony said:
V-ROMs must be 8-bit and the ones here would require 32Mbit ROMs... and since 27c322s are 16-bit only you can't use them for V-ROMs.

The only option would be to put together some custom modules for the V-ROMs or just use a multi-cart.
Click to expand...
 
I contacted the developer on Facebook and it seems that the final prototype will arrive in two weeks and if it works he seems willing to share it. <3
I love this community full of very capable people !
 
Check this Illusionrip user progress on his adapter:

1722444043838.png


on passe a la V3 sur ce projet, car au debut c'était pour les Vrom de sons des cartouches AES/MVS en 32 M-Bit...
mais un client m'a demandé de lui remplacer une Crom (gfx) pour un shock troopers 2...
la seule difference entre les deux c'est l'envoi des donnees en 8 Bits pour le son et 16 bits pour le graphisme
donc le challenge c'était de faire une Eprom bi-gout, sur une seule PCB, et en 6 couches (oubliez le routage automatique), et passer du 5V au 3.3V avec 5 levels shifter....
avec 2 dixième en moins, ca doit être bon....

1722443995639.png
 
Are your eproms costing 50-100$? cuz that's the going rate for 'conversions' i'm seeing today.. I was going to make some of my own carts assuming it would only be 1-2 bucks per a chip.. am i grossly underestimating?
 
Jinx said:
Are your eproms costing 50-100$? cuz that's the going rate for 'conversions' i'm seeing today.. I was going to make some of my own carts assuming it would only be 1-2 bucks per a chip.. am i grossly underestimating?
Click to expand...
Since I wrote that the supply of neogeo carts on Aliexpress has dried up completely, at least for vendors that ship to my part of the world. Also all the 161 in 1 carts seem to have disappeared off of Ali...

Its a fun project, would recommend. These notes might be helpful

My cost to do the conversion was something like
Eprom burner (Xgecu t48 with 42 pin adapter) = about $50
loads of awesome uses beyond this project. I got the cheap 42 pin adapter with a standard socket , next time id get one like this with a ZIF socket to save me having to pry the chip out each time https://www.aliexpress.com/item/1005004658951890.html
Eprom Eraser = $10 from the local ewaste trader, id get a bigger one next time, erasing eproms two at a time got boring

Eproms = about $35 for a big game like Blazing Star.
This was a bit of a hunt because for several of the chips I only needed one. In a lot of cases the chip was 50 cents and the shipping was $3
Misc other parts = maybe $1
Donor cart = I think I paid $10 for this ages ago
 
Awesome! I have an eprom writer I just got (top3002 for 99$) and your basic Eraser that does work. I've flashed a few arcade chips for other repairs i'm trying so i know everything works. What Confuses me is what chips you can and cannot use on neo carts.. I guess there is no regular style romchip for 32mb and higher which some neo games use, and for those you have to use the newer style small rom chips that require and adapter board? is that correct? I have a few busted carts i bought off ebay, like a puzzle bubble that was 12 bucks and it has one of these style chips in there.. (really ugly looking too). a circuit board with 2 small fine toothed chips on it, then some like crappy tape holding it from touching the board and its soldered on. My plan was to rip all that out and try to do something cleaner.. I figured since its already a ruined cart i'm not really hurting its original value/stature..

Is any chip that fits pin wise up to 32mb gtg?
 
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