Comment by Findecanor

30 years ago, I used Trash'em One on the Amiga. It was a text editor, 68000 assembler, debugger and memory monitor in one. I preferred it over its predecessor Asm One (which had been based on Seka), but I don't remember what feature it was that made me switch.

https://www.pouet.net/prod.php?which=92408

You can run Asm One in the browser here: https://archive.org/details/ASM-One_v1.02_1991_Gram_Data