On Fri, Jul 31, 2026 at 9:38 PM Rich Alderson via cctalk < [email protected]> wrote:
> Bill Degnan via cctalk <[email protected]> writes: > > > https://www.vintagecomputer.net/browse_thread.cfm?id=833 > > > New TU56 Tape Images Available for simH use. I will post updates on > this > > thread, but if anyone is interested in messing around with the images > > using simH, feel free to download and explore/use. > > Just out of curiosity, what is the internal format of these images? > Most especially, what is the internal format of the "18 bit" file? > > <snip> I dont' know. I watched as Dave Gesswein ran them through his TU56. I was able to load the pdp8 and pdp11 tape images using simH, I have not yet tried the pdp10 tape image. The TU56 is a universal drive and as I underatand it (barely), and if I understand correctly the tracks of 00's are ignored and/or are used to indicate what kind of system made them, 12, 16, or 18 bit. I am still learning about TU56 tape storage. Sorry I can't provide a substantial answer to question Bill > > >
