and problem solved, ended up figuring it out
I now have it booting up just fine and have Open Transport 1.1.2 installed, now I can backup the 520 via FTP like the 520c and only need another AAUI transponder so I can do both at the same time, woohoo.

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Welcome, new comrade! I'm glad you solved your problem, but I still have a couple of "peripheral recommendations" to help w/future problems.

1) Get a the proper cable, a/o adapter and a bootable, external Mac CD-ROM drive and start collecting the Disc Images you need to do boot/installs.

2) Get the SCSI Disk Mode Cable and a pass thru terminator to couple with the above cabling/adapter and you can back up any Problematic PB with that mode without any working OS on the 'book. [] ]'>

3) Using SCSI Disk Mode you can install any system on a 'book from any stable Mac w/OS compatibility. [] ]'>