HN user
It's not a solution for low-traffic personal email servers. I've tested 3 domains in Postmaster Tools and for all 3 there's no data (I've added them a month ago or so - there should be data already)
No data to display at this time. Please come back later. Postmaster Tools requires that your domain satisfies certain conditions before data is visible for this chart. Refer to the help page for more details.
It's different from one AS to another. I've spent a lot of time maintaining reputation for my IP at a certain major ISP (no bulk email) and I'm still getting blocked from Google and others.
Then I got a VPS at Linode (for some other purpose), installed Postfix and emails were just working - no SPF or even reverse DNS set up.
IP reputation IS a thing.
Vim was created on Amiga, so that's explainable
Your bible was the memory map, probably. This is a very basic one (this one is rather for POKE than SYS):
http://www.c64-wiki.com/index.php/Memory_Map
You'd have to look for kernal memory map with entry points or BASIC memory map.
Like, perhaps, this one here: http://unusedino.de/ec64/technical/aay/c64/krnromma.htm