Hi there!
I have received a huge PC tower, with inside an old motherboard (socket 5) which measures 33*22 cm! It must be installed horizontally and I've never seen such a strange format for a mobo!

Can anyone tell me the name of the form factor used? Because it looks like the tower screw holes won't let me put a newer slot 1 ATX mobo!

:'(

Can you show us a pic of the main board and the backplate?

I finally found the motherboard on the ASUS site. It was difficult to find it because even though the mobo is a socket5, it was listed as a socket7!

Here is the link to the mobo page:  [http://support.asus.com/download/download.aspx?SLanguage=en-us]ASUS support page[/url] (choose Motherboard, Socket7 and PCI/I-P54TP4)

So the model name is PCI/I-P54TP4. I don't know what's the name of this form factor? Is it AT?

here are the pics, that's the way the mobo is meant to go in the tower, horizontaly (keyboard port on top left).

PICS REMOVED

Well judging by the power connector on the mobo it is an AT board.
You might have some difficulties with this box...
hope you are handy with various tools, you will probably need to make new holes to fit the ATX screws positions and also very possible that you will have to do some mayor cutting on the backpanel.
If you like metalworking go for it, if not get another box

(some pics of the box's backplate would be useful to see)

I did some backplate mods once due to low funds and I would really suggest to use some proper tools (when I was doing it I just had a small drilling machine and some mid sized cutters and it really sucked)

would you please resize your pics, they are rather big, 800x600x32 is the limmited size here, you could host your pics at:

http://www.imageshack.us/

just us thum nails that more modem friendly.

but yeah that Mainboard is rather strabge, it's from week 18 year 1996 though ;) you can find that on it's backside near this inprint:

YANG AN   TA-1
C114139  94V-0
9618 --> Year 1996 week 18 ;)

Aaargh!  :o  Big screenies!   ;D

Took me nearly an hour to scroll to the far right side of the screen!  ;)

Well, earlier (October 1995) we had a Pentium 75 which had such a longer AT motherboard too.
My 386 and 286 motherboard are the same size too.

The formfactor is AT.
The smaller boards are named : Baby AT

It's nothing special though ;)

I know it's nothing speacial, but the case where it was is huge and would have been perfect for putting a newer ATX... but no right holes and wrong backpanel...

Thanks all!

no problem Luxkiller65 ;), nice find man.

Nice, but pretty useless...

Gonna have to toss the tower away I suppose...