Thanks Rupert, the batteries were exactly where you said. As for the Mac, I guess I'll just have to borrow a laptop of some sort!
Ed Cook April 2020
After looking at a technical service manual for an AX100, it's not totally clear if this has changed over the various different versions over the years, but there appears to be a battery access flap on the front edge of the till, just under the keypad. The batteries appear to be mounted in a holder that pulls out of this access flap.
Sorry, I'm unable to find any advice on Mac connectivity.
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