How do you actually do that? I ran mine for years with a single, borderless full screen CLI window but that hardly disabled the windowing system, you could still run GUI apps.
My recollection too was while you didn't need Workbench itself, windowing and the multi screen support was all ROM based and always there.
My recollection too was while you didn't need Workbench itself, windowing and the multi screen support was all ROM based and always there.