Has anyone else had issues with the clock circuit on the CPU?
First I had to use a 74ACT04 to get the thing to oscillate. Then I needed to change R42 from 6K2 to 4K7 and R41 from 13K to 6K8 to get the timing within spec. I measured the caps as being within 5% of their marked values.
Was the 8224 outrageously priced back in the day?
Also, and this is just a rant, why make a near exact duplicate of the original board? It's still not an original and never can be. Just not sure why the opportunity was not taken to correct some pretty easy to correct problems with the original board such as the aforementioned clock, trace routing issues, layout, bypass capacitor locations, etc.. It would be easy to eliminate the jumpers and utilize some more modern chips to reduce the chip count and make the whole thing work more reliably.
Maybe if I ever get my project queue cleaned up and have some free time before I turn senile I'll give it a shot.