So I'm having an odd issue I'd say. My scsi2sd is working fine, except in my blast city cabinets.
It works normally on my Aero, Astro, and Supergun. I tested it at another friend's and it works normally on an egret 2. I've tested the voltage across all cabinets and it's normal. I also tested it at a friend's house with 2 more blast cities, so it's 4 different ones and none of them work. I was however able to make it work in my blast city by providing USB power from my computer or another usb psu. I've tried connecting the floppy power connecter and not having it, it doesn't matter. So it's something about the blast city power supply that the scsi2sd doesn't like?
I have the 5.1 version green board with a full size sd slot and floppy power connector. I've updated the firmware to the latest 4.8.1 version. I know everything is configured in the scsi2sd-util correctly because it works everywhere but my blasts. When I boot it up on the blast city the LED stays lit. Everywhere else it blinks and then turns off, blinks again on reading the cd. The motherboard comes up with the CD ROM is not connected properly message.
To make things even weirder I tested it with my friend's setup that's the 5.0b version red board and it worked fine. So something about the 5.1 version and the blast power supply is not working as expected.