CP-M Z80 home brew computer circuit board

Nope. The 179x require an external data separator, as well as precomp ciruitry and floppy-interface buffering, as well as requiring +12 (although the Fujitsu clones need only +5). It's the 279x that have the internal data separators, but the 1770/72/73 have just about everything in a neat little 28-pin package. About all you have to supply is side and unit-select logic, which is easily done with a write-only latch. Add address decoding logic and you're pretty much done. DMA not required. This contributed hugely, IMOHO, to their being popular on a number of low-end "home" computer systems. The chip handles motor control (e.g. spin-up time from from motor on to ready, auto motor-off after a certain number of inactive revs), which the 179x doesn't do. The 765-based all-in-ones such as the National 8473 and the WD37C65A are about as hard to obtain and are a little more difficult to interface to a Z80 (just about require DMA and interrupts to work right). Cheers, Chuck