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by jdmoreira 3420 days ago
A lot of the ZX Spectrum functionality and logic is in the ULA, an ASIC.

There's a whole book on the ULA - http://www.zxdesign.info/book/theZXSpectrumULA.shtml
1 comments
dfox 3420 days ago
Actually there is now design out of 74ls series logic that replicates functionality of the ULA (it is probably completely bug-for-bug compatible), IIRC it was designed by author of said book.
link