Chuck Guzis cclist at
Sun Apr 15 11:34:07 CDT 2018

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.


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