I’d also recommend Chris Smith’s “The ZX Spectrum ULA: How to design a microcomputer”<p><a href="http://www.zxdesign.info/book/" rel="nofollow noreferrer">http://www.zxdesign.info/book/</a><p><a href="https://alibris.com/search/books/isbn/9780956507105" rel="nofollow noreferrer">https://alibris.com/search/books/isbn/9780956507105</a><p><a href="https://www.amazon.com/ZX-Spectrum-Ula-Microcomputer-Computer/dp/0956507107" rel="nofollow noreferrer">https://www.amazon.com/ZX-Spectrum-Ula-Microcomputer-Compute...</a>
This is one of the best ROM listings, I've ever seen: the comments are informative and detailed, making it easy to follow along! A great source for anyone interested in Z80 code or eager to learn.
This is a transcribed version of the original, then saved as A4 PDF. The original was, for me, more readable, being formatted for the smaller pages but using them effectively.<p>The original can also be found on the internet, but it's a "classic" pdf of scanned images.<p>Does anybody know if transcribed version, but either as a source document or as saved for the original, smaller format, exists? Or if somebody merged the transcribed text with the original images and made an ultimate pdf of the book?