Commodore1551 Floppy Repair: I built a whole new interface!

Thanks to https://pcbway.com for supplying the pcbs used in this video.
The 1551 was Commodore's attempt at making a parallel disk drive for the TED series computers. Unfortunately it was tied to the TED machines by specific hardware, so it never got wide adoption.
I got this example "untested" (ie broken) in a job lot, and in this video I'm going to try and get it working.
But what do you do when the only dead IC is one that is completely unavailable? Watch to find out...

Commodore History's benchmark video:    • Update to my previous video on why th...  

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00:00:00 - Introduction
00:01:23 - Teardown
00:04:09 - Fixing the Door Latch
00:08:22 - Inside the Paddle
00:09:47 - Power itUp
00:13:50 - A Test Program Off the Internet
00:19:36 - EEPROM Programming
00:22:20 - Dismantling the Paddle
00:25:45 - EEPROM Adapter
00:32:36 - Testing the EEPROM PLA
00:34:43 - Interlude: Case Repair
00:40:33 - NEW PLA Test
00:41:50 - Let’s Just Try The Drive On Its Own
00:43:11 - Scope Tests
00:46:38 - Enter PCBWay…
00:47:24 - And A 6525 From Poland
00:53:23 - Test with New Cartridge
00:55:35 - A New Test Program
00:59:29 - New Test with Old Paddle
01:01:08 - Transferring the Cable to the New paddle
01:05:57 - Test: Drive + New Paddle
01:09:23 - Retest the Original PLA
01:11:22 - Performance Test and Benchmarks