IDK, now it can count 23 fibonacci numbers and extra 24th overflowed one in 5~ seconds before HALTing (It's was programmed to count 24) and the clock speed is 1.8~ Khz (3700~ steps per second), however it is unstable because of counters, I will try to fix it but if the counters load then the CPU runs flawlessly. And the CPU needs 2 words (3 if MOV reg, addr) and overall 4 processes (Fetch, Fetch, Fetch or ignore, Execute). I could share it in other platforms if needed, overall the ROM itself has 15 / 20 words (I dont remember exactly how much) overall with values in other addresses to test MOV reg, addr.
The big jump will be N-86, but its progress has been frozen due to DLS bottlenecking itself and it runs slowly and it is the reason why I can't even test it, there is another project N-16-E to enchant N-16.