So, I took the pictures from http://www.planetvb.com/modules/hardware/?type=vue&sec=flash_rom_pcb of the official FlashROM cart and made an “X-ray” image with the two halves overlaid.

I was examining it and, based on the pinouts I have, it looks like /INTCRO (the interrupt line, pin 9) is connected to the Flash chips’ A18 (Note: I’m only assuming it goes to the same pin, but it obviously goes to both chips.)

No matter how I look at it, I can’t figure out how I’m seeing it wrong. It also looks like the “audio pass-though” pins are messed up. Could it be a different pinout from the “production” model VB?

I’ve attached some images: Top, bottom, an enhanced “x-ray” version showing the problem I’m having, and the pinout from the Flash data-sheet.

Attachments:

1. 

   official-membo-x3-flash-cart-top.jpg
   

2. 

   official-membo-x3-flash-cart-bot.jpg
   

3. 

   problem.jpg
   

4. 

   sharp-lh28f008sat-pinout.png
   

Yes, you’re right, the pinout on this cart is different. It’s a prototype cart that worked with the WCES/Shoshinkai VB prototypes, which had this different pinout as well. It’s unknown whether there are/were also flash carts with a retail pinout, since this is the only one than ever surfaced.

Hmm… Maybe something to that effect should be added to the page about it?

And again… you’re right, Amos.

Is that the only pin that differs?

… and the sound pins…

Are there any pinout available for this version of the V.B?

I made a pinout of it a long time ago, but IIRC almost all the pins were shifted by one pin from the final.

DogP

DogP wrote:
I made a pinout of it a long time ago, but IIRC almost all the pins were shifted by one pin from the final.

DogP

I wonder what the reasoning behind that was… Maybe they just found out it would be more efficient to route the cart and/or main-board if the pin-out was changed a bit. Then again, it could also have been some kind of theft deterrent, like those special lug-nuts that require a matching wrench. Or none of the above