On 7/17/23 09:28, Henry Bent via cctalk wrote: > Hi all, > > I just noticed that images of a full RX50 floppy set for Ultrix-32m 1.2 was > posted on Bitsavers ( > http://bitsavers.trailing-edge.com/bits/DEC/vax/ultrix/1.2/ULTRIX-32M_V1.2_RX50_1986.zip > ). I am having difficulty parsing these images into a usable raw format > for SIMH. > > As a reference, TUHS has a set of 1.0 floppies ( > https://www.tuhs.org/Archive/Distributions/DEC/Ultrix-32M/ ) that are > usable for installation purposes. (You can ignore the 1.2 floppies in that > archive, they aren't actually a full set). The first disk of that > installer, 32m-1.0-bin/01, has a bootloader that starts at byte zero as we > would expect. This should be approximately equivalent to disk 1 in the > Bitsavers set. Oddly though, in the "raw" dump the bootloader doesn't > start until 0x1400, and a number of the other disks I looked at appear to > have odd holes/zeroes in them. IMD format dumps of the 1.2 disks are > provided but when I converted the IMD format to a raw image I got the same > issue. > > I'm almost thoroughly unfamiliar with IMD - is there some obvious > extraction/conversion option that I am missing here? Were these disks > actually imaged correctly? I would appreciate any suggestions.
A quick glance at the RAW dumps tells me that the sectors are interleaved. I haven't checked to see if it's the standard FILES-11 interleave, but it looks likely. --Chuck
