Rob Doyle wrote: > As a clarification, it looks to me like the sector header data "words" > are always 16-bit, regardless if the disk pack is formatted for 16-bit > data or 18-bit data.
That's how I understood it too. > From a hardware point of view, sector header "Word 3" and "Word 4" > have no particular meaning. Just for completeness, can you point me > to a reference where "pack number" is defined or used by the software? Here's where the pack number is written to the header: https://github.com/PDP-10/its/blob/master/src/kshack/nsalv.261#L5399-L5401 And here's where it's read back: https://github.com/PDP-10/its/blob/master/src/kshack/nsalv.261#L5107-L5109 I don't know why it's done this way. It seems to go back to the Systems Concepts DC10 disk controller for the AI lab KA10. _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
