- Ḥadīth (/ˈhædɪθ/ or /hɑːˈdiːθ/; Arabic: حديث, ḥadīṯ, Arabic pronunciation: [ħadiːθ]; pl. aḥādīth, أحاديث, ʾaḥādīṯ, Arabic pronunciation: [ʔaħaːdiːθ], lit. ’talk’ or ‘discourse’) or Athar (Arabic: أثر, ʾAṯar, lit. ‘remnant’ or ’effect’) refers to what most Muslims and the mainstream schools of Islamic thought believe to be a record of the words, actions, and the silent approval of the Islamic prophet Muhammad as transmitted through chains of narrators. In other words, the ḥadīth are attributed reports about what Muhammad said and did (see: Oral tradition).
- Reverse-engineering the Z-80: the silicon for two interesting gates explained (righto.com)
I’ve been reverse-engineering the Z-80 processor, using images from the Visual 6502 team. One interesting thing about the Z-80’s silicon is it uses complex gates with multiple inputs and multiple levels of logic. It also implements an XOR gate with an unusual pass-transistor circuit. I thought it would be interesting to examine these gates at the silicon level and show how they work.