That's what I thought, too, but in another thread MichaelM points out we have at least the following:

(1) M65C02 on GitHUB or M65C02 on OpenCores
(2) cpu65c02_true_cycle on OpenCores

For further reference, see ElEctric_EyE's 6502-Core Comparisons.

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

Yes, there are various ways to debounce a switch. Garth mentioned an RC followed by a Schmitt-trigger, and BDD's Maxim DS1813 suggestion is also good.

As shown below, several other options become available if the switch is a double pole type (ie, equipped with both Normally-Open and Normally-Closed contacts). These options may make better use of available resources (ie; if your project has leftover gates available).

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html