Atari ST - DMA error and fault finding

This Atari ST was sent in to me by a viewer. It booted up OK but failed to read disks. However... it's not what you're thinking, the floppy drive was fine. This was the first time I'd encountered an Atari ST with this kind of fault, and proved to be an interesting repair! #AtariST Join this channel to get access to perks:    / @retrocomputingreboot   **This video is kindly sponsored by PCBWay, your one stop shop for PCB's, CNC machining, and 3D printing. As an existing customer, I can vouch for them and their service. Don't forget to check out their Project pages for inspiration! https://www.PCBWay.com Songs by TELL YOUR STORY music by ikson™ https://ikson.com/tellyourstory