The two logic chips for address decoding (not connected, and non-functional, too) are more or less hidden under the robbon cable. Looking under it reveals a 74LS08 (Quad 2-Input NAND), and a 74LS32 (Quad 2-Input OR), as seen on Miguel Angel's photos. However, on Kevin Thacker's webpage, the second chip is listed as 74LS136 (Open-collector Quad 2-Input XOR) - so, it seems the daughterboards were randomly fitted with whatever cheaply available chips (possibly including damaged chips - ''can somebody verify that?'').
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== Spanish Laws == Hypothesis & Facts (compiled by deepfb.) ==
=== 64K RAM Limit ===