nesdev.org

whicker, your comments about Anno 2070 really caught my attention. That was one of the games (prior to launch) which I made note of to pick up/try, since I do like games of that sort, but the DRM situation immediately made me change my mind. I'm glad Ubisoft reverted their stance on that. To be fai...

there's something about appropriate use of technology here... Why not use a Raspberry Pi as a ROM emulator (load a pair of SRAMs, then get out of the way). Why not use a Raspberry Pi to build a flash chip programmer with a decent user interface. Why not house a Raspberry Pi in an NES case (from a br...

I've been playing Legend of Zelda: A Link to the Past most recently. One dungeon per night. Even though it's possible to go a lot faster, the point was to limit play time sessions and just enjoy the experience. I've still been periodically playing through Super Mario 3D Land . It's getting tedious t...

I'm assuming that I need to have A15 involved somehow, but I thought Lorom ignored A15 anyways? Can anyone help me out? :) A15 is very important in a LoRom cartridge memory map when you have backup memory! With /ROMSEL (/CART) signal going low, you need to distinguish if the access is for the SRAM ...

Oh well...the Retron 5 will be coming out later this year and it has HDMI out...so it may possibly be exactly what we all have been waiting for. I've seen a functioning Retron 4 (5) test hardware and empty plastic case. Yes the HDMI was working as expected (barring some trash lines). The genesis ga...

Well, hey, look at that, you've got the green light to go.

good luck.

I don't know how anyone will truly ever know, unless it's possible to just ask somebody that did work on the project. I know Dylan Cuthbert talked quite a bit on the software side. Maybe one of the hardware or systems programmers will be willing to talk now (sometime?) here's one of them (and you ca...

qwertymodo:

not criticizing, but how did you arrive at the BA0..BA7 naming convention?

I looked at your schematic again, and mine maps bank 6xh the same way yours does. Bank 6xh means BA5 and BA6 (A21/A22) are both high. In your schematic, that selects Y3 low, combined with A15 low selects RAM_CE unless both /RD and /WR are high. Yes, exactly. I was okay with it not perfectly matchin...

After extensively looking at this, I can't find a reason why what you have wouldn't work. The only caveat is that the FeRAM maps into banks 60h-6Fh as well as banks 70h-7Dh. I don't forsee this being a problem. Bank 6xh with A15=0 is ordinarily for the DSP-1 or whatever coprocessor for certain rom s...

Alright, A20 from the flash chip goes to cart edge pin 46. Chip Select on the flash chip would be the output from an OR gate: Flash /CS = pin 49 (/ROMSEL) OR pin 47 (S-CPU A22) In the exact diagram, you could also use the other half of the 74139 chip to make the OR function. 2A input tied to GND, 2B...

I'll answer this better tomorrow.
I just got back from anime central.

Yes A20 would just go from the chip to the cart edge.
You still need chip select logic so that the chip isn't always sending out data.
It's not Y0 nand Y1.

well, I know I'm probably pointing out the obvious, but the program bass is receiving -arch=table
Then it goes on to complain that "table" isn't one of the valid choices, and tells you what the choices should be.

Looks great. As far as I can determine with my "chip being upside-down and rotated 180" sense, it appears to be wired correctly. Like all unused gates, I'd just recommend you tie the two unused inputs of gate "D" to Vcc or Gnd. I'd recommend GND because I think you have a ground ...

Oh wow. It's beautiful... :lol: Actually that was pretty clever to use "DRL" gate technology (diode-resistor-logic?) You probably will be able to use just one NOR or NAND package to come up with some sort of equivalent circuit. Just do some research about the series you do pick (save some ...