Wow, great stuff! Thanks for sharing. Exactly what I needed.
I think I found some minor errors in instruction pre-decoding, PD-xxxx10x0 and PD-0xx0xx0x have wrong values I believe.

I want to run code extracts in an emulator to evaluate code size and execution speed. In addition to being able to execute the code in debug like fashion I also want to know number of clock cycles spent, instruction trace, memory access maps, register state, memory inspector, ...

Is there a tool ...

In a BASIC ROM, you need to have subroutines implementing multiply and divide anyway. So from a code size perspective, it costs very little to make use of them. Using a Taylor series (which has a regular structure, so you can loop its generator code) might well end up as smaller code (albeit slower ...

Stumbled into this topic from a web search on Cordic.


Clock frequency 198.4 KHz
Precision 30 bits, including sign
Time for CORDIC operation 5 ms


In my implementation for 65C816 (precision: 128 bits) a sin/cos with arbitrary argument can be computed in 70/80 ms at 4MHz clock

Cordic: 992 ...