Just replace that burnt 0,1uF 275VAC X cap made by infamous RIFA (you may even remove it, it will work without it) and it shall be ok. If you decide to replace, remember to use an X (or better X2) class capacitor.

Electrolytic capacitors seem to be ok, this is definitely not a leak, this is a glue, that holds them in place. Source of a smoke was this 0,1uF X2 film (MPF) capacitor on the primary side.

As I can see, this is a 120VAC (USA) PSU, so 200V cap is just fine.

Motor ON is common for all floppies, and regardless which one is selected, motor starts in all, this is normal behavior. In the standard SF314, the DS1 line from Atari STf is connected to the DS0 pin in the drive, so the drive itself has to be set for DRIVE0. In short ST, there are both lines presen...

...but it is apparently wrong (or at least incomplete)

Instead of trying to fine a working pinout, just use DIN pinout and a multimeter to create a signal map for this 14 pin Chinon connector.

I meant - use the DIN connector pinout to map the wires in Chinnon connector to the appropriate signals, and then rewire them for a Shugart connector. Remember about the differences between PC Floppy and the Shugart standard (namely Motor ON and Drive Select lines). 1 - n.c. 2 - n.c. 3 - GND 4 - Hea...

Just use the Atari 14-pin drive pinout and map these pins accordingly. You may also check if pin 3 is ground, then it is likely to be 1:1 to Atari FDD DIN connector pinout. https://obrazki.elektroda.pl/1407143800_1570372883_thumb.jpg 1 - Read Data 2 - Side Select 3 - GND 4 - Index 5 - Drive Select 0...

All 1Mb EPROMs are too long, but that is not a problem, you'll easily find a wire wrap method to put them in. For 2 EPROMs you need just 47LS11, but to have TOS 2.06 (or 1.62) you need some additional address decoding logic (a GAL or a bunch of TTLs). If you want to reverse from 2 ROM to 6 ROM you j...

Update.
I was apparently wrong with 2027 as being the last possible to set date. It is 7 bytes in TOS, but 7 bytes from 1980, not from 1900. So the limit is F9 for pseudo-BCD year, which gives 2059. I have verified it in practice.

HxC is older than FF, I I find it more compatible. It is also a paid software, but if you have a HxC bootloader, you can (and should) update to the current version. FF emulates HxC, and uses it's manager (autoboot.hfe), so it is not different from it in usage. Only difference is HxC uses binary conf...