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. -Henry
