The only difference between 12F675 and 12F629, is that the former has ADC suport. I don't know if it is needed as the source code not available, so the only way to know is trying (they are rewritable PICS), or an aswer from @aje_fr. I would also like to know, as the 12F629 is cheaper, more available, and is the same PIC used to make Modchips for PlayStation, and Sega Genesis, so i have a buch of them around

Finally an alternative to the ultra expensive, for what it is, infinikey-cps2. Nice work @aje_fr!
That is what I'm hoping as the 12F629 is cheaper and the one I can get at my local electronic store. The infinikey is great for a nice clean look but I'm a cheap DIYer and don't care to much about looks. Great for those ops that don't do much repair *cough Kyle

I can't say the same for Voutar stuff (price wise) then again the designer need to justify their time
I am a collector, an original board with battery will always be the best, rarer day by day, and more valuable, so i am planning to do it easily removable in case i ever want to restore the original battery powered state in before to trade or sell a board.
I plan to design a plug for the CN9 connector on the B board with a breadboard, the PIC, and an angled JST connector. Plug and play, detachable by hand whenever I want, and it cannot be cleaner than that... At least on later B board revisions, let's see what i come of for older boards without CN9 connector, but there is not any trully clean design for them.
@undamned I first saw the infinikey at VGP store at 18,45€ each

, no discount for quantity, and i had no idea they were on sale elsewhere til today. $10 - $8 seems more like a fair price for it, as it is not a difficult or complex design, and the bill of materials should be fairly low, but i cannot agree with the way you made the product; it is based in Eduardo's freely released hard work, and i think the correct way of doing this would have been to release the sources and schematics and then sell the boards for people not wanting to build one themselves. You did not do that and now it seems to me like you are trying to earn money, in part, on some one else's work, even if it were a single dollar, without giving anything back to the community. I respect people with less knowledge about this stuff that only had the option to pay, but i do not need to.
Now i am glad there is an alternative, not really significantly more difficult to install than the infinikey, using a widely available PIC, and no extra hardware needed, as it can be programmed in your local electronics shop for about 1€, if you provide the Hex file in a USB stick, or bought preprogrammed in some online elechtronics shops
