I have an old system board for a pinball machine that I'm fixing up. One of the ROMs is failing post. The reason is because the 27S256 EPROM never had the sticker applied to the window, and due to a series of circumstances the EPROM wasn't touched for several years so it became altered via incidental lighting.
My question: Is it safe to replace this part with a CMOS part of the same Pinout and type? Is it safe to mix Schottky and CMOS?
Please correct any factual errors in the above. A little new to this.
EDIT: it's not a 27S256, it's a HN27256G-25. I couldn't read correctly. According to some googling it is an NMOS part. Can I mix NMOS and CMOS