@breadbin @SinclairSpeccy

There are some minor future iterations of the #MOS6502. Of course there are the #WDC65c02 and #WDC65c816 but #CSG also did the #CSG65CE02 which has a Z register and can move zero page using a Base register and can use all of RAM as a stack. It also adds a word address mode and can run at up to 10 MHz.

There is also the #CSG4510 which was intended to be used in the #C65. It's essentially the CSG65CE02 with some extra stuff.

https://en.wikipedia.org/wiki/CSG_65CE02