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