Denise de Vries's Blog

Finally, we have confirmation for the original hardware, an HP9845 with an external floppy drive, the HP9895A Disk Drive attached to it. The disks have 77 tracks, or cylinders, and contain 30 sectors with an interleaving factor of 7. The machine was marketed for scientific purposes and was widely used in the university’s medical centre […]

By Denise de Vries, posted in Denise de Vries's Blog

29th Sep 2016  2:17 PM  1899 Reads  4 Comments

Becoming more confident in the low-level encoding, it is time to look at the reproduction of actual bit streams. Our current knowledge, together with the directory listing, strongly suggests an HP system of the 1980s.  The call for input brought up some more information on possible disk formats. A colleague (in another city) who worked […]

By Denise de Vries, posted in Denise de Vries's Blog

28th Sep 2016  5:37 PM  1240 Reads  No comments

The story so far An 8″ Floppy Disk Challenge Digital Obsolescence: Reproducing Floppy Data Cables Spinning up the first 8″ disk Running more informed experiments in the 8″ world Getting desperate: Down to the Physical Layer After confirming as well as we could that our hardware setup of the 8” drive and the adapters was […]

By Denise de Vries, posted in Denise de Vries's Blog

14th Sep 2016  1:45 PM  3082 Reads  3 Comments