Additional notes on the ZX81 emulator
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1. There is no saving

2. Files on disk have to be in Spectrum format, not ZX81 .P/.81
   I have no idea whether loading actual ZX81 tapes into the emulator would
   work or not.

3. There is no hi-res graphics support

4. I have re-done the snapshot file so it now starts up the ZX81 at the
   cursor prompt, rather than half-way through a game.

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