How much RAM did the first Macintosh have and how much of a percentage increase would this be when compared to a modern Mac that is maxed out on RAM?
The first Macintosh, released in 1984, had 128 kilobytes (KB) of RAM. This was considered a significant amount of memory at the time, but it is minuscule compared to the amount of memory available in modern computers.

For example, as of 2023, the maximum amount of RAM that can be installed in a modern Mac Pro is 1.5 terabytes (TB), which is over 12 billion times more than the original Macintosh.

In terms of percentage increase, if we compare the original Macintosh to a modern Mac Pro with 1.5 TB of RAM, the increase would be roughly 1.2 billion percent. It's worth noting that this is a somewhat meaningless comparison, as the computing capabilities of modern machines far exceed those of the original Macintosh, and the demands on computer memory have grown exponentially over the past several decades.
Can you list the stock RAM amounts and the device limits for various Mac models over the years?
Sure, here's a list of the stock RAM amounts and device limits for some popular Mac models over the years:

1. Macintosh (1984): 128 KB
2. Macintosh II (1987): 1 MB to 4 MB
3. Macintosh Quadra 900 (1991): 4 MB to 64 MB
4. iMac (1998): 32 MB to 128 MB
5. Power Mac G4 (1999): 128 MB to 2 GB
6. PowerBook G4 (2001): 256 MB to 1 GB
7. MacBook Pro (2006): 512 MB to 2 GB
8. MacBook Air (2008): 2 GB
9. iMac (2009): 4 GB to 16 GB
10. MacBook Pro (2010): 4 GB to 16 GB
11. MacBook Air (2015): 4 GB to 8 GB
12. MacBook Pro (2019): 8 GB to 64 GB
13. Mac Pro (2019): 32 GB to 1.5 TB

It's worth noting that the stock RAM amounts and device limits for Mac models can vary widely depending on the specific configuration and model year. The amounts listed above are intended to provide a general sense of the trend of increasing RAM capacity over time.