Me, My 6-slot, and some motherboard questions with pictures!

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buaku

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I've had this 6-slot for maybe close to a year and I finally got around to cracking the thing open to get a nice look at the bottom board and it just brought up a whole lotta questions!

One nice thing I noticed is someone already ripped out the old battery and put it longer wires to a battery taped to the side of the board.
img5897vt4.jpg


Something odd is it doesn't seem to have its original BIOS. Looks like an EEPROM to me. Very interesting!
img5898hj7.jpg


Now for the stuff that caught my eye!

This chip here seems to have a resistor across it for some reason...is this some sort of repair?
img5895qp6.jpg

Also that 24MHZ crystal has a wire soldered around it...what's up with that?
There's a 32.768KHz crystal near the batter area that has the same kind of thing going on too.

Also there's these empty sockets up there. What was the point of those?
img5899tr7.jpg


One last thing is anyone know what size standoffs are on the 6-Slot. I'd like to get more to plaster around the cart area and get more feet to hopefully give it more support.

Thanks!
 
channelmaniac

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buaku said:
Something odd is it doesn't seem to have its original BIOS. Looks like an EEPROM to me. Very interesting!
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Close. It's an EPROM. If it's not a UniBIOS then someone may have simply put a BIOS for a different region on it.

buaku said:
This chip here seems to have a resistor across it for some reason...is this some sort of repair?
Click to expand...

Nope. That's a standard thing from SNK.

buaku said:
Also that 24MHZ crystal has a wire soldered around it...what's up with that?
There's a 32.768KHz crystal near the batter area that has the same kind of thing going on too.
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Ground strap. It keeps the crystal in place and grounds the case.

buaku said:
Also there's these empty sockets up there. What was the point of those?
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They are unused on the MVS. SNK must've had something planned that didn't materialize.

buaku said:
One last thing is anyone know what size standoffs are on the 6-Slot. I'd like to get more to plaster around the cart area and get more feet to hopefully give it more support.
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I forget the size... 18mm threaded hex standoff IIRC...

RJ
 
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buaku

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Thanks! You are awesome! Somehow I had a feeling you'd have all the answers, lol.

I guess I thought EPROM AND EPROM were the same sorts of things.

I have a new mouser catalog here. I'll have to go digging through that. It's hard to get an idea of size by looking at some outline in a catalog sometimes. I really like having a paper catalog from them though. If you know basically what you're looking for it's way easier to go thumbing through a catalog versus trying to search their website.
 
Hewitson

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EPROM = Erasable Programmable Read Only Memory

EEPROM = Electronically Erasable Programmable Read Only Memory
 
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buaku

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MKL said:
An EPROM bios is regular on the first batch of early boards like the 4-slot, 6-slot and 1st revision AES. The EPROM in these cases is always a Toshiba though and the window is covered with a sticker bearing SNK codes.
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That's good to know! I have a sticker elsewhere on that board that says NEC V4.

MKL said:
On the empty sockets:

http://www.neo-geo.com/forums/showpost.php?p=128205&postcount=12
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Seems like expansion slots of old that never got used, like on the NES and SNES.
 
Hewitson

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The NES expansion was used for the Famicom Disk System.

The SNES one was used for the modem and the various backup units that were available.
 
Neo Alec

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Hewitson said:
The NES expansion was used for the Famicom Disk System.
Click to expand...
No, the Disk System connects to the cartridge slot. A lot of people think it connects to some expansion port on the bottom of the Famicom because the Disk System is usually shown sitting underneath it. The Famicom does have an expansion port on the right side, but it's for accessories like the 3-D glasses and Zapper, since the original Famicom doesn't have control ports to plug into.
 
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buaku

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Hewitson said:
The NES expansion was used for the Famicom Disk System.

The SNES one was used for the modem and the various backup units that were available.
Click to expand...

I always wanted a SNES backup unit. Thought that would have been cool as hell!


Valsimot said:
Don't forget the CD addon for the SNES that Sony was building, the Playstation!
Click to expand...

I bet someone is kicking themselves over that, lol. I remember being kinda shocked when I first learned about that.
 
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