1581 Followup: Let's get this thing working! (and figure out why it isn't)

Thanks to https://pcbway.com for kindly sponsoring this video.
So in this part 2 video we are going to get to the bottom of what's wrong with my 1581 builds, figure out what doesn't work, and what does, and why, and how to fix it.

We're gonna start with a big stack of drive mechanisms....

SFD-321B to Amiga drive mod: http://jope.fi/drives/sfd321b-lcp3/
Badgeman case stickers: https://retro8bitshop.com/retrostore/...

Github page for the floppy adapter I built in this video: https://github.com/gianlucarenzi/Amig...

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00:00:00 - Introduction
00:03:40 - Baseline Tests
00:05:52 - Drive 1 - SFD321B
00:08:14 - Drive 2 - Techmedia TFD310
00:10:18 - Drive 3 - NEC FD1321T
00:11:44 - Drive 4 - SONY MPF920
00:13:05 - Drive 5 - SAMSUNG SFD-321B #2
00:15:07 - Drive 6 - CHINON FB-354
00:16:35 - Drive 7 - TEAC
00:18:01 - Drive 8 - CHINON
00:19:32 - Drive 9 - SAMSUNG SFD-321B #3
00:20:54 - Baseline Test Results
00:25:03 - Building a Different Adaptor Board - PCBWay
00:35:10 - Comparing Adapter Schematics
00:38:33 - Scoping Pin 34 - Tom’s Hardware Adapter
00:42:01 - Pin 34 On the Yellow Board
00:44:41 - Interface wired up correctly this time…
00:48:25 - Presentation of initial results
00:52:57 - C5 Cap Fix
01:02:39 - Testing Amiga Converted Drives
01:04:19 - Drive #5 as an Amiga Drive
01:06:46 - The Infamous Drive 9, modified
01:09:54 - If converting an SFD-321B works, why doesn’t the adapter?
01:13:34 - Testing the Modded Adapter
01:20:28 - Badges
01:21:54 - Coda: another SFD-321B
01:26:58 - Summary