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I'm a huge Amiga fan, but what is there to learn from it that couldn't be obtained by working at the lower levels of a modern system?

Devices are memory-mapped without going through many nested protocols (USB, PCIe, etc). What drivers do is completely transparent. Library calls are a simple subroutine which jumps into the real details, without a privilege barrier.

Much of the accessibility of the architecture is that it's a single address space, with no MMU interference to speak of (later models had MMUs, but where only used for a few enhancements here & there at best).

Besides, 680x0 code is much more pleasant to deal with than x86. But that's the case for pretty much any non-x86 ISA. ;-)

Well, unlike modern machines, the system was made to be simple enough to understand while being as powerful as possible.

Modern computers, on the other hand, have to either up the complexity by quite a bit and keep the power ( trying to rewrite an old and simplistic DOS based mandelbrot set generator for modern system got me mostly battling my misundertanding of SDL: putting bytes in A000 was way simpler. ) or sacrifice power by going back a generation or two...

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