Thank you so much for the photos. I checked all the connections and it confirms that KS202 and PAL16L8 pinout is the same as in previous version ( with the exception that KS202 pins 12 / 13 are swapped - looks like my previous guess was wrong). Even all the 74 chips are routed the same way (except AND gate input pins 9/10, but this is logically the same of course)
Indeed 74189 are used to latch the CHR banks, but this chip is rather rare because I couldnt find it in Eagle database.
The AND gate is only used to generate CPU-A12 & CPU-A13 & CPU-A14. What I found interesting is that there is place to solder 3 diodes + resistor to replace this 7408 AND with diode logic
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