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Just dug out my NES and set it up to test the SMMM cart I finished yesterday. YEA! IT WORKS!! Spent the afternoon learning/making noise )
Used a Tennis Cart, NES-NROM-128, a 27c256 & 2764. Take Note: I used sockets on both so they are a little taller then the top of the cart shell. Not much but it hangs up a little on the top part of the 'Cart loading frame'. not a biggie, but got to be a little careful sliding it in an out.
  Aside from my console's gamey cart connector (had to tear it down and clean/tweak the pins) works like a champ, except an odd glitch. When I tap UP, some times the overdrive doesn't seem to work but the audio get very overdriven (may be the way it's suppose to) AND the video starts loosing sync and  goes B/W. Tapping again (or is it DOWN) goes back to normal (well if you can call these beats "Normal"
All an all, great fun, THANKS! neilbalwin for your gr8 code and !RESPECT! na7; you da man.

just to doc :
Open Golf-
NES-SNROM-05 1987   'N' MMC1B3
CR2023; R1, 2 & 3; D 1&2; C8; installed. 'SL' jumper OPEN
PRG- 32 pin

Spot-
NES-SNROM-05  1987   'N' MMC1B2
*no Batt*. R1, 2 & 3; D 1 & 2; C8 empty. 'SL'  jumper CLOSED
PRG-28 pin

Kid Icarus-
NES-SNROM-02  1987   'S'  MMC1A
*no Batt*  R1 installed, R2 & 3; D 1 & 2 Missing. No footprint for C8. Jumper bridge under D2 CLOSED
PRG-28pin

Just a thought, it occurred to me that the boot problems may be related to the backup batt. On the Golf cart, and I'm guessing others, the CR2032 is welded to the battery clips, so a weak batt can not be replaced. If it IS weak could it corrupt the ram during backup periods?

I reallllly want to try this. Got the Willem burner set up and some ebay carts enroute, but wanted to hear from peoples that got one or both working and what carts they used? NES carts that work: Zelds, Bard's Tale: Nen Open Golf not so much?
I got a Kid Icarus, SPOT & Nen Open Golf coming. Will have to add battery to SPOT I think, but no biggie.
Just wanted to round up the winning carts

I never got the Midines I ordered in '08, so be warned, Chris is very flaky! There are complaints all over the net about him. If you can find one on Ebay well go for it. But to me I don't want yo encourage that guy at all. I got off on a rant in another thread about him, he had posted about his plans for a 2.0. I didn't find the post till after 6 mo, so I don't know if he will ever see it, but I just saw RED seeing his words.
There is another project that's just starting to bear fruit, Chip Maestro. as well as NESserial that's a little more DIY.
Best of luck

As you may know the Convox is a simple R2R DAC with parallel inputs.
What this means is there is a string of resisters with tap points along the  series. Each bit from a parallel bus connects to one of the taps, so if the bus is driven with a Byte/Word value the resisters sum the "1"s for a output voltage, somewhere between 0 & 5V . More "1"s, the higher the sum voltage will be.
To use this DAC on USB (serial) you would need something like one of FDTI's chips and a latch to hold the current sample. In addition you need the driver softs to handle sending the samples out at a constant rate to reproduce the wave sound. not easy with USB (USB transfer rates depend on the mode) or use a uC to receive the samples in a FIFO and latch them on to the DAC.
All do-able but quickly becomes very complicated.
Yogi