This is a replacement for 40 PIN W65C02S or W65C816S CPUs that enables the user to swap which CPU their system uses by a jumper or switch connected to the jumper. Perfect for the OtterX or Commander X16 developer or enthusiast who wants the ability to switch between CPUs.

Features:

• Both CPUs on a package slightly larger than a single DIP-40 CPU
• Intelligent mode switching which holds the inactive CPU in reset with busses in Hi-Z
• LED indication of active CPU
• LED indication when the W65C816S is in native mode

This module also contains a workaround for an issue in the Commander X16 PCB that can cause unreliable operation when the only peripheral in the system is a cartridge and the CPU is a W65C816S.

Errata for EV2

There are possible compatibility issues with these which may make them unsuitable for some systems. These do not affect OtterX or X16, but may affect others:

• Clock outputs from W65C02S are not routed to pins
• E, MX, and VDA outputs from W65C816S are not routed to pins