Comment by anthk

Kim-I emulator and assemler written in T3X/0:

https://t3x.org/t3x/0/sim65kit.html

Calculator:

https://t3x.org/kimuno/kimcalc.html

If you can get microchess and know a little of 6502, you can trivially adapt the ACIA serial code to the I/O of the simulator from T3X.

Also, T3X/0 itself:

https://t3x.org/t3x/0/index.html