Unfortunately, 8652 is a non-functional unit. It only displays a solid green screen when you turn it on (tried the usual cartridge wiggling, cleaning, etc). On the upside, the video does glitch when reset is pressed so there is something partially working. Some repair work is likely necessary. Minor: the red LED does not light up either.
It looks like the STIC1A ASIC is not fully seated. At least from the photos, it appears that the corner nearest the "A" in STIC1A is a bit raised.
If you have a PLCC extraction tool, I'd say "pop it out" and have a look at both sides. (And if you do, take a photo of the bottom if there's anything interesting there.)
The EXEC (RO9580/P586) I believe is just EXEC 1, not the full WBEXEC. But, it's a 9580, so it has capacity for 8K decles. I wonder if they put anything in the other 4K? P587 is the WBEXEC.
The EXEC is socketed, which is interesting in its own right. Skippy (the first board I analyzed) had it soldered in.
This is date code 8912, which is the earlier of the two date codes we've seen. I think we've seen 8912 and 8930. IIRC, we haven't seen other date codes.