I sold off one of my Tandy 1100FDs not too long ago. It was the unmodified one (i.e. with the real floppy drive). But it looks like I also sold it with the only good power supply that I had for them.
Today, I took out my Gotek-enhanced 1100FD and powered it up for a project to play with the CGP-115 (color printer/plotter). For some reason the printer wouldn't work with my Linux box with the USB/Parallel cable.
So I fired up the 1100FD and... it wouldn't. Then it finally started up. Then powered off. Uh, oh! Is it broken? It looked like a power issue. But it stayed up, so I had some fun playing Star Trek. But it powered off in the middle of the game.
Now I knew that there was a problem. So I checked the power supply. 9.5V and seemed stable. I moved the cord (thinking there might be a short), but no problems. But I felt like it was a power supply issue since this PC was just sitting on a shelf for a while.
So I located a power supply from the spare parts box that was the correct voltage, but low amps (I figured that would be OK since the floppy was no longer physical) and, low and behold!, it worked without a problem and stayed up.
Now I know that the C-64 had power supply issues. Over time, C-64 power supplies would go bad and increase the 5V power line and fry your C-64. That's why we tell people who find old C-64's at their parent's house to get a new (yes, they actually make new ones) power supplies for their C-64 before they play with it.
So my 1100FD power supply didn't do that (fortunately), but finding a replacement power supply was hard. It took some searching to find a 9V 2A center-negative power supply. But I was successful in the end.
