Commodore 8-Bit 5 1/4 Inch Disk Images

August 20, 2026, 2:26pm 1

So, as a side project to a side project, I made a (web-based) tool that lets you explore the contents of any 5¼" floppy disk images for Commodore 8-bit computers. (That is, the D64, D80, and D82 formats, D71 may follow, if this should be in demand.) This also lets you bring home what you may have found on those disk images, either by copying data views or by extracting and downloading individual files in usual formats (e.g., PRG or P00 for programs).

To go along with this, I produced a write-up, which comprehensively contains about most of what I know about those disk image formats. (This is also meant as a guide for your very own adventures in Commodore floppy disk images.)
Both said tool, as well as the blog post in question come with various color coded markup in the data listings, just mouse-over those sections to gain deeper insight and see what’s what.
(A small update later this works even better, as this is now using an appropriate implementation from scratch instead of generic title attributes.)

(Ah, well, contained in the same page along with the disk image inspector, there’s also a tool for composing and downloading D64 disk images, just to close the circle. Both tools are contained in dialogs, because they were designed as helpers for a web-based emulator. All these run exclusively in the browser and no data is transmitted anywhere.)

4 Likes