CMOS for NMOS
cclist at sydex.com
Sun Apr 15 19:24:35 CDT 2018
On 04/15/2018 05:08 PM, allison via cctalk wrote:
> On 04/15/2018 10:25 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?
> No, and why?
> Changing to CMOS can cut power drain. However speeding up clocks can
> make the packet controller
> broken even if it runs! If you keep the 6mhz clock all will be fine.
Quite correct, Allison. I confined my answer to "Can I drop a CMOS Z80
into an NMOS Z80 socket?"
And in particular, why not run the 10MHz part at the original 4MHz or
whatever? A 10MHz part doesn't mean that it has to run at 10MHz.
As to the rest of the question, I confess that I was blind.
More information about the cctech