Installing a Unibios 2.0 in a MV-1B & MV-1C
- Thread starter Alex0916
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It looks like it is very hard to change the bios in a MV-1B motherboard. Look at this set of pictures and decide if you want to try.
http://unibios.free.fr/soldered/
Anyone know if the bios in a MV-1C are a prom or a surface mount chip?
http://unibios.free.fr/soldered/
Anyone know if the bios in a MV-1C are a prom or a surface mount chip?
Well it's not me who is going to try it's my friend. He has done plenty modds before I just need to get the pin layout so he can do it. Someone pleaseNeoGeo on Brain said:
me as soon as I get this info I'm heading straight to my friends house so he can install it.
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The pin layout is identical to the 27C1024 chip used to hold the UNIVERSE BIOS, 1 to 1, 2 to 2, 3 to 3 and so on.
Please let us know how you go and pictures during the process would be nice also as this is one of the harder mods to do.
Raz
Please let us know how you go and pictures during the process would be nice also as this is one of the harder mods to do.
Raz
deffty
Kula's Candy
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I modded a MV1b before but I don't really recommended it.
The mv1b comes with Irritating maze and cannot be used with normal MVS games if you don't mod the bios.
Its very tedious, time consuming and frustrating,
had to be very careful with it.
The pins out is exactly the same as a 27C1024C eprom like what razoola say;
(1 to 1, 2 to 2 etc..) just put the eprom(unibios) on top of the original bios and solder wires to the legs.
I used a socket for it for future upgrade.
See pictures;
The mv1b comes with Irritating maze and cannot be used with normal MVS games if you don't mod the bios.
Its very tedious, time consuming and frustrating,
had to be very careful with it.
The pins out is exactly the same as a 27C1024C eprom like what razoola say;
(1 to 1, 2 to 2 etc..) just put the eprom(unibios) on top of the original bios and solder wires to the legs.
I used a socket for it for future upgrade.
See pictures;
The 1C is not the same as all other MVS boards. The 1C uses a 57C4200 equivalent pinout. I've sent you two PDF's -- one for 27C1024 equivalent (1B board) and one for 57C4200 equivalent (1C board).
I recommend putting the socket on a perf board for extra stability too.
If you stick a 27C1024 on a 1C (without the proper wiring), it won't work.
Jeff
I recommend putting the socket on a perf board for extra stability too.
If you stick a 27C1024 on a 1C (without the proper wiring), it won't work.
Jeff
Yes, I've done a few of them on 1B and 1C.
However, I am running out of 57C4200 eproms rather quick so I will have to start wiring them to use 27C1024 eproms, which really isn't a bad thing as the 1024 is cheaper and easier to find.
The nice thing about the 57C4200 (or M27C400) is that they are 4 Mb, which means you could easily put up to 4 bios images on a single chip -- a normal bios & uni-bios would be an example, and use a switch to toggle between the two.
Of course, you can do the same on the other MVS boards too, just pick up a 27C2048 for two bios images or a 27C4096 or M27C4002 for 4 bios images. With the uni-bios though, all you would really need is the standard bios and uni-bios. Those that have the 1B though, you could have a nice bios set up for UNI/Normal/IMaze.
Jeff
However, I am running out of 57C4200 eproms rather quick so I will have to start wiring them to use 27C1024 eproms, which really isn't a bad thing as the 1024 is cheaper and easier to find.
The nice thing about the 57C4200 (or M27C400) is that they are 4 Mb, which means you could easily put up to 4 bios images on a single chip -- a normal bios & uni-bios would be an example, and use a switch to toggle between the two.
Of course, you can do the same on the other MVS boards too, just pick up a 27C2048 for two bios images or a 27C4096 or M27C4002 for 4 bios images. With the uni-bios though, all you would really need is the standard bios and uni-bios. Those that have the 1B though, you could have a nice bios set up for UNI/Normal/IMaze.
Jeff
neo_X7 said:So is is possible to mod a MVS-1C with unibios, have you done one yet?
Here are the links to the two different rom pinouts we are discussing...
M27C400 - http://www.st.com/stonline/books/pdf/docs/6674.pdf
M27C1024 - http://www.st.com/stonline/books/pdf/docs/2381.pdf
The 27C400 is the equivalent to what you would find on a 1C, except of course in DIP package, not SOP.
M27C400 - http://www.st.com/stonline/books/pdf/docs/6674.pdf
M27C1024 - http://www.st.com/stonline/books/pdf/docs/2381.pdf
The 27C400 is the equivalent to what you would find on a 1C, except of course in DIP package, not SOP.
Razoola said:Can you send me that 57C4200 pdf also please
Raz
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Multi Bios MV-1B board
Would solve a lot of problems. ROTD for one. Do you have a MV-1B running with a multi bios? More of a mod than I would want to try but if someone is doing this mod I would pay to have it done.
JMKurtz said:
Would solve a lot of problems. ROTD for one. Do you have a MV-1B running with a multi bios? More of a mod than I would want to try but if someone is doing this mod I would pay to have it done.