On 04/15/2018 07:25 AM, David Griffith via cctalk wrote: > > I'm pondering upgrading the CPU of a Pacccomm Tiny-2 Mk2 radio packet > controller from a 6Mhz Z80 processor and SIO to 10Mhz parts. My problem > is that the parts already in it appear to be NMOS. The family is still > being made by Zilog, but for 10Mhz parts, CMOS is all they have. Can I > just drop in CMOS, change out the crystal/oscillator and have things > work as expected?
The I/O on the NMOS Z80A chips is TTL-compatible. You should have little problem dropping in the CMOS version. The same applies for similar chips, such as the 80C85/8085, 80C86/8086, etc. --Chuck