This is my first forum post. I wanted to say hi and introduce myself. My name is Mateusz and I am from Poland.
Recently I have wanted to build my own versions of "replicas" Apple 1.
PCB board made of publicly available gerberas. Most TTL ICs from my own old stock. Instead of DS0025, I used DS0026 from my local store. Capacitors C5 and C6 according to the scheme - 1uF.
I built two versions. One on the AM1404APC in DIP, the other on MM1404AH in TO99. Both versions work fine. RAM chips are MK4027. In one version there is a MOS 6502A processor, in the other one, a counterfeit MOS 6502 bought in China (which also works!). Oneshot from 74123 is 480ns. (47pF mica and 19KOhm).
Unfortunately, I do not have a working 2519 chip, so I used a "prosthesis" 6x4557 (SMD and DIP versions). Works flawlessly. "Prosthesis" is also used in the second copy. Instead of PROM, there is EPROM on a small PCB, similar for the 2513. It is quite convenient, because you can easily and cheaply test various modifications without wasting the precious 82S129 (etc).
The computers started up without any major problems, but I read a lot of valuable advice from this forum before getting them started. Thank you very much for that.
I invite you to view photos and a short film.
Mateusz / SQ9PXB