Upgrade to Rev.4 from older versions of Sparrow LITE board

The main difference between Rev.4 and older versions of Sparrow LITE boards is in another 3 signals added to the internal system connector ZX_AUX50 - /NMI, /M1 and /RESET.

So in fact you can upgrade the Sparrow LITE Prototype 2, Prototype 3 or Rev.3 to Rev.4 by soldering three wires to board, as you see on photos:

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