On 05/04/2017 04:30 PM, js--- via cctalk wrote: > On 5/4/2017 6:16 PM, Terry Stewart via cctalk wrote: >>> If these are from a VAX, could they be microcode disks for a >>> 11/780? >> There was a RX01 attached via a LSI-11 as console. > > And yet, if there were an RX02 somewhere on this VAX, I don't > believe you'd be able to read them at all... RX02 seeming more likely > with a VAX.
If it's an RX02 operating in double-density mode, you're not going to read the disks with any commodity floppy controller. You will, however, get the sector ID headers. DEC used a rather peculiar scheme where headers were recording in single-density (FM), but the body of the sector (the data) is recorded in a "peculiar" MFM, that employs some pattern substitutions to avoid conflict with similar patterns in the headers. A catweasel will work just fine--and there's code out there to handle it. --Chuck
