flash (or ide) storage for unibus 11?

Johnny Billquist bqt at update.uu.se
Fri Nov 27 15:26:52 CST 2015

On 2015-11-27 19:34, Mark J. Blair wrote:
>> On Nov 26, 2015, at 04:29, Jerome H. Fine <jhfinedp3k at compsys.to> wrote:
>> After that worked successfully, I became disappointed
>> that I had to deface the floppy media with the extra holes.  The
>> simple solution was to use a DPDT switch and flip the detection
>> circuits so that the RX03 drive would signal a double-sided media
>> what there was a single-sided index hole and the DPDT switch was
>> in the alternate position.
> Wouldn't that approach result in the sectors being shifted with respect to the index hole vs. the case where the conventional index sensor positions are used? I would imagine that it's a moot point if the disks are being formatted, written and read on the same drive, but I can imagine interoperation issues if you later punch the second jacket window to read/write the disks on an unmodified drive.

If the drive were to use the same offset from the index hole to data, 
and so on, yes.
But why would a drive keep those constants the same if the hole moved?


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

More information about the cctech mailing list