nesdev.org

Yeah, bend the pins up, solder wires to them.

Noise isn't a problem at all, just make sure you connect any unused pins (like PRM to vdd or vcc).

I've done this.

Use an 32 pin IC socket, and it sticks out a little.
Bend up the pins (1,2,31,32) and put a piece of tape underneath.

Is the 2A03s CPU core based off the 6502 or 65C02?

Reason I'm asking, is because the BIT on the 65C02 has three additional addressing modes (zero page indexed by X, absolute indexed by X, and immediate).

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And post you want a Famcom Disk System belt.
I got a reply within a few weeks, the guy wanted $5 + $6 shipping from Hong Kong.

I think its a simple matter of the circuit being different. When I have some time, I will "draw" out the schematic in simplified form from the PPU to the composite output. My guess is that just "buffering" the PPU output with an emitter follower isn't enough. There might be some ...

Pin 37 is CLK 21.47727 Mhz (NTSC), which, if you divid by 12, you get M2 which is 1.7897725 MHz.

The 2A03 must have an internal divider (12), as the 6502 outputs the same clock speed that comes in; however, it is slightly delayed, which is why you must use phi2 out of the 6502.

M2 (or Phi2) is the clock from the CPU.

When high all address and data lines are valid.

BTW, what's the CPU doing when phi2 is low?

Could it be reading/writing memory? or are the address/data lines in set up state?

Hey blargg,
If I wanted to run this on real hardware, what would I do about the CHR-ROM? (or are you using CHR-RAM?)

Oh, I almost forgot to add, if you're going to use EPROMs, you'll need a UVC emitting light. I've been able to make one for about $15. You need a germicidal bulb (quartz). here: http://www.topbulb.com/find/Product_Description.asp_Q_intProductID_E_48194 And I bought the 4" fixture at Home Depot ...

Firstly, You can get cheap Flash/EPROM/EEPROM programmers here: http://www.sivava.com/ or http://www.willem.org/ If you're thinking about programming Genesis EPROMs, get the 16bit adapter for 27C160 and 27C322 whilst you're at it, you will save on shipping. You can get cheap cheap 16 megabyte (27C16...

I was hoping this was going to be easier to implement than writing it in software, and on the up side I would have more CPU cycles to work with. However, things aren't quite going as I had hoped. I got ahold of a oscilloscope and made sure that the crystal is working at the correct frequency. My add...

Ok, so I decided to put a 16450 UART into an NES. I'm having a bit of trouble getting it to work properly, and was wondering if someone could spot an error in my schematics. I built the thing already, tried initializing the UART and writing to it. So far no go. The basis of my design came off the C6...

Is there a NES emulator that has a neato monitor/debugger like VICE (the Commodore 64 emu) ?

I hate using zeners to drop voltage. It wastes power, makes more heat and there is a possibility that the zener will short out and burn up whatever it is your powering. Some semiconductor manufacturer did a study on zeners, and found that 99% of the time they short out, not go open. I've seen 3.3V r...

This is the kind right here: