The following question is more for fun than anything else, but I've been thinking about how realistically vintage the PAL-1 is, hardware-wise. From a software and UI point of view it's an exact clone of the KIM-1, but some of the components weren't around in 1975.
I first got interested in electronics a few year later, around 1977 or 78, so I'm basing the following on what I remember from that time.
The 6502 and 6532, as well as the TTL support logic were all around in 1975, of course. I think the 556 time circuit is vintage as well.
I think that the RAM and ROM chips are too large for 1975 and are probably from the early 1980s - is that correct?
The large-digit LED displays are late 1970s, I think. The original had smaller digits relative to the footprint of the component.
The PCB is higher density than the original KIM board, perhaps because it has more layers. Could they make PCBs like that in 1975 or is that newer technology?
And I'm not sure that the ceramic capacitors in 1975 were as small as the new ones for that range of capacitance, but that may be wrong.
As I wrote, these questions are just for fun and for completeness. The PAL-1 is certainly vintage enough for me, though it would of course be nice to have an original KIM-1.