A small update for those following the progress.
We spent a lot of time wondering what to do about the 'hard to find parts' - namely the 6800 micro and the 9602 oscillator chip - both are getting harder to find and if you do find them the price is starting to climb.
We found that a 6802 micro, whilst also classed as 'obsolete', is much easier to find and comes with a few bonuses. It has a built in oscillator circuit requiring an external crystal and a couple of caps, it also has inbuilt RAM which means that the 6810 RAM chip can be left out - this is a particularly handy point as this RAM chip is in the battery 'corrosion zone'.
So our work to date allows for jumpers to be used to build the board EXACTLY like the original if you have, or are able to get (for example from Ken), the correct parts. If you can't then with a few extra parts you can use the 6802 micro.
We think that is the best of both worlds really.
