MV1C Unibios install issue

FairlanePhantom · Apr 13, 2009

Got everything together, and the board won't boot. At first I did it pin for pin, and it didn't work. Then I found out that the pin out is almost completely different, so I changed it and got no response. Then I swapped the Unibios, and it's still just the same screen. Everytime it has turned on since I started this, it boots to a color block screen and goes no further. Can it be an issue of how the bios was written?

Macck · Apr 13, 2009

Wrong PIN sequence i think.

[]'Macck

Xian Xi · Apr 13, 2009

FairlanePhantom said:
Got everything together, and the board won't boot. At first I did it pin for pin, and it didn't work. Then I found out that the pin out is almost completely different, so I changed it and got no response. Then I swapped the Unibios, and it's still just the same screen. Everytime it has turned on since I started this, it boots to a color block screen and goes no further. Can it be an issue of how the bios was written?

Double check the wiring and also try connecting pins 40, 39 and 38 to +5v.

Murray · Apr 13, 2009

Xian Xi said:
Double check the wiring and also try connecting pins 40, 39 and 38 to +5v.

I've installed one on an MV-1C. It works and I did have to do these extra connections.

Xian Xi · Apr 13, 2009

So have I but a few of them I had to and then they worked. I want to know why you need to do this sometimes.

Also test it with a stock bios just to make sure the wiring is correct. You can use the bios from any Neo MVS board, except for the 1B.

FairlanePhantom · Apr 13, 2009

Didn't know I could swap it with a standard. Right now, the only pins that don't have anything are pin 38 and 39. I don't know if any of you have your pin sources listed, but here is the one I went from:

PCB 1024

01 ----> NC
02 ----> 28
03 ----> 27
04 ----> 26
05 ----> 25
06 ----> 24
07 ----> 23
08 ----> 22
09 ----> 21
10 ----> 02
11 ----> 11
12 ----> 20
13 ----> 19
14 ----> 10
15 ----> 18
16 ----> 09
17 ----> 17
18 ----> 08
19 ----> 16
20 ----> 07
21 ----> 40
22 ----> 15
23 ----> 06
24 ----> 14
25 ----> 05
26 ----> 13
27 ----> 04
28 ----> 12
29 ----> 03
30 ----> 30
31 ----> 01
32 ----> NC
33 ----> 37
34 ----> 36
35 ----> 35
36 ----> 34
37 ----> 33
38 ----> 32
39 ----> 31
40 ----> 29

I have nothing else connected to rom besides these.

Xian Xi · Apr 13, 2009

Yup that's it, if it doesn't work after that then connect 39 and 38 to +5v. I usually just connect all 3 of them together 38, 39 and 40.

werejag · Apr 14, 2009

maybe that why my install didnt work

FairlanePhantom · Apr 14, 2009

Well, I found two wires that were in the wrong places, and figured there would be more. I tore it all apart and did it over again, and now all the wires are in the right places. I also connected 38, 39, and 40 so they all had +5v, and it still doesn't work. I took a Unibios out of my 2 slot and it still does the same thing, though putting the other Unibios in this one now makes my 2 slot not boot, though i may have hit a patched trace job I did.

What other possibilities are there? seeing how nothing is bridged between pins and all wires are where they're supposed to be.

Xian Xi · Apr 14, 2009

Can you post a vid of it running on the 1C?

Razoola · Apr 16, 2009

I remember one person on the forum had a problem on a 1C that turned out to be using wires that were to long.

Xian Xi · Apr 16, 2009

Good point Raz. I want to see a video in case he has the click of death going.

Neo Alec · Apr 16, 2009

With all the rewiring you've done, I'd be surprised if all the pads and traces are still okay. That was the problem with some of my first soldering jobs, I soldered and resoldered them to oblivion.

kernow · Apr 16, 2009

Xian Xi said:
Also test it with a stock bios just to make sure the wiring is correct. You can use the bios from any Neo MVS board, except for the 1B.

and 1AX , well unless you want to undersolder it. hehe

jediurchin · Apr 16, 2009

Slightly ot but where does one get a unibios from? I want to pop one into my 1FZ

kernow · Apr 16, 2009

pm 'razoola' on these boards. or http://unibios.free.fr/

Xian Xi · Apr 16, 2009

I think everyones first MV1C unibios mod goes awry like this all the time. Mine did. My problem was when I first did it I made a wire for each pad so when I wired it up I had to redo it and shift everything over by 1 since pin 1 was supposed to be NC and then I had to connect 38, 39 and 40 together.

jediurchin · Apr 16, 2009

kernow said:
pm 'razoola' on these boards. or http://unibios.free.fr/

Sadly it seems they only support the 3.0 version. Ive read around and only want the 2.3 as this seems to be the most reliable

Hewitson · Apr 16, 2009

Wtf? All versions are downloadable from the website.

If you mean they only seem to sell 3.0, I am sure Razoola is more than happy to burn you a 2.3. Of course I don't understand why you would want one.

jediurchin · Apr 16, 2009

According to a few of the more knowledgable members here 2.3 is more reliable for some reason.

Xian Xi · Apr 16, 2009

PM Raz, he can burn you a 2.3 I would think.

Neo Alec · Apr 16, 2009

3.0 works fine, and on that one you can disable the splash screen to make the system run much more OEM.

FairlanePhantom · Apr 16, 2009

I'll see if I can post a video soon. Though I checked the traces on that 2 slot, and the unibios I put in there from the 1c won't boot either. I put an original in the 1C and it won't work now.

kernow · Apr 16, 2009

You've always been able to disable the splash screen no? on MVS anyway.

I run a 1.3 in my MVS .

:vik:

it would still be a 1.0 but the data rotted off the EPROM :spock:

Razoola · Apr 19, 2009

I don't know why people think 2.3 is more stable than 3.0 (well maybe I do). If you get an original 3.0 you will find that its very stable (just as stable as 2.3). If you buy one from some non official person then your most likly going to run into stability problems. There are very good reasons why this is but its not due to the unibios coding, more about people editing it.

Raz

MV1C Unibios install issue

Mai's Apprentice

Edo Express Delivery Guy

JammaNationX,

Akari's Big Brother

JammaNationX,

Mai's Apprentice

JammaNationX,

Galford's Poppy Trainer

Mai's Apprentice

JammaNationX,

Divine Hand of the UniBIOS,

JammaNationX,

So Many PostsNo TimeFor Games.

Superior Being

Crazed MVS Addict

Superior Being

JammaNationX,

Crazed MVS Addict

Metal Slug Mechanic

Crazed MVS Addict

JammaNationX,

So Many PostsNo TimeFor Games.

Mai's Apprentice

Superior Being

Divine Hand of the UniBIOS,

So Many Posts
No Time
For Games.

So Many Posts
No Time
For Games.