nesdev.org

OK, so I worked out a pretty good design for the EtherNES: Here's a quick description of how it is laid out: 1. Any cart that wishes to use the EtherNES must connect pin 14 (2A03 R/W) to pin 16 (Exp. 42) on the cart as well as pins 39-41 (2A03 A12, A13, A14) to pins 52-54 (Exp. 7-9). This routes the...

Here's a Schmartboard for prototyping with the 100-pin TQFP with 0.40" pitch: http://www.schmartboard.com/index.asp?p ... _qfp&id=72

Only the 100-pin TQFP version of the PIC has the parallel slave port.

More good news. I was looking over the datasheet for the PIC18F97J60 and it says the following: In addition, one of the general purpose I/O ports can be reconfigured as an 8-bit Parallel Slave Port for direct processor-to-processor communications. This is exactly what I had in mind. I've got to look...

I can see using an address line as a makeshift R/W but there is only one address line on the expansion bus: A15. You'd need at least two. One for chip select and one for R/W. If you had two, then A15 could be the chip select and A14 (or whatever would be the R/W). That would mean address $8000 could...

The product number is generated based on features. Download and look at their product catalog pdf file. The part I ordered samples of is listed on page 38 and 39 of the catalog. On page 39, it shows you how to generate the product number for the part you want. The part number I used was EBC24DKSN wh...

I'm pretty sure Sullins part number EBC24DN will work. I just ordered a couple of samples so I'll be able to test it out in a few days. To answer your questions, yes this would allow for you to easily create a plug in device that would route the audio in/out pins in the expansion port to some of the...

Awesome. I found a place that can make NES expansion port connectors: http://www.sullinscorp.com/

That is a possibility and probably what the Nintendo engineers intended to do. That would mean that they could control which carts can access expansion devices. Only carts with the R/W pass-through would work. That is the path of least resistance. I'll just do that. BTW, I was able to find card edge...

bad news. pin 4 on the expansion port is connected to /NMI on the CPU, not R/W. That means, there is no way for an expansion port device to map to a specific hardware address. If R/W were on the expansion port, then the combination of R/W, A15, and D0-D7 would make it trivial for a device to map to ...

I just cracked open my NES and did a continuity test on pin 4 of the expansion port. It is connected to pin 33, /NMI on the CPU. Mystery solved. This sucks though because now there is no way to memory map I/O with the expansion port. Without the R/W pin on the expansion bus, there's no way for a per...

Crade,

I'm going to correct the mirroring bit inversion problem in libcopynes so that the values that are returned from the library are correct. Just a heads up.

What sort of other applications would you all be thinking about?

8-bit MMORPG

good work BTW.

I haven't looked at your code yet but did you wind up inverting the mirroring bit when writing out ines files? I've been dumping carts with my command line tool and carts that are listed as known to be vertical mirroring come back from the copynes with a horizontal mirroring bit value and vice versa...