I wish I had taken a pic of my old Atari 520ST.
It had originally been designed for 512K of
RAM. I upgraded it to 4 meg (all that it would support) using 4116
RAM chips salvaged from old Atari and Williams video games that had been scraped (the Williams System 4 games like Robotron and Joust all had 48K) and a whole bunch of hand wired decoder logic because the memory controller only supported 4164, 41256, or 411000 memory chips. I had a hand built
PSU that used a series of linear voltage regulators and a heat sink about as big as an SLK-947U, with a big knife switch to power it all up. The mains transformer was a solid hunk of copper wiring about the size of both my fists and weighed about 40 pounds. All of this plus the mobo and floppies was mounted on a 4x4 sheet of plywood. The system kicked out enough radio frequency trash that I could watch my desktop screen on channel 7 of my mate's TV, and it killed CB and police band radio reception for about a 3 block radius around my house.