Hi,

Simple answer is “Yes”, have had this even on a Rev 1D1 mainboard. The answer maybe that the top RF shielding is needed. Or the drive motor has become too noisy on the drive.
Is the drive by chance a Panasonic one?

Actually yes it is a newer panasonic drive.  This is an Escom Amiga made in France.  I've suspected it could actually be the floppy drive drawing too much current on motor start.  Its not a shielding problem, its the 5V rail dipping and the monitor loses sync, I can see it on my scope.  It happens even with all shielding installed.  I've tried different power supplies so its not the supply.  I've tried a different video cable.  This is a bare bones mainboard no accelerator.

oops replied to myself

A friend mentioned this to me today, and the full article is available online.

https://www.theguardian.com/games/2024/apr/26/my-undying-love-for-the-painfully-uncool-amiga

Yes, see my response in this separate thread:
https://forum.amiga.org/index.php?topic=75191.0

I doubt if it was actually a case of "CBM ordering the wrong memory type" as suggested in this thread; more likely there was a supply or cost issue with the usual DRAMs qualified for the design, and this was a short term solution to allow use of an alternative DRAM part.

@Sugo77

Please don’t send any monies from the info Snitchy Cunningham has provided.

Send me a PM and I might be able to help you, like any good person in the Amiga Community would 😉

Snitchy Cunningham? Who's that?

@all I've updated the post to make it clear where the copy/paste from the 27 year old Aminet readme ends in case anyone thinks it's my instruction/suggestion.