On Mon, 17 Jul 2023 at 13:06, Henry Bent <[email protected]> wrote:
> On Mon, 17 Jul 2023 at 12:59, Ethan Dicks via cctalk < > [email protected]> wrote: > >> >> > From: http://www.chdickman.com/pdp11/pro380.txt >> > >> > "The RX50 floppy starts at track 1. Track 0 is logically placed after >> > track 79. The sectors are interleaved 1, 3, 5, 7, 9, 0, 2, 4, 6, 8, >> > 10. The track shift and interleave must be taken into account when >> > moving disks between real PDP-11 and emulators." >> >> I have had good luck with a secfor convolver from the same page as this >> comment: >> >> http://www.chdickman.com/pdp11/lbn2rx50.c >> >> It will go both ways, to and from physical block order and logical block >> order. >> > > That seems to have worked perfectly. Thank you for the utility and the > explanation. Now off to working on the next steps! > > -Henry > A brief follow-up on this: After lots of (virtual) disk-swapping I was able to upgrade an existing 1.0 system but was not able to install a 1.2 system from scratch. It seems that there is some sort of bootloader issue with a clean install, which I suspect might be a SIMH problem and I will follow up there after some more investigation. I truly feel for the folks who had to do this at the time, using 38 floppies on a MicroVAX I. The installer does give time estimates for certain milestones so that you could go and get a coffee or whatever. "Configuring vmunix, this takes about 30 minutes" is certainly indicative of the relative speed of the machine at the time. Also there is an indication that there was a tape distribution but so far that has not surfaced. I'm not even sure what medium that would have been - RC25?
