I wrote:
> The reason I specifically want an HSC50 rather than a newer model is
> that the HSC50 (with sufficiently old CRONIC software) supports
> 576-byte sector mode as needed for use on a PDP-10.

I should clarify that I want to use the HSC50 on both the PDP-10 and
on VAXen.  It looks like I may have one or more opportunities to get
later HSCs from people on the list (thanks for the offers!), and
perhaps I'll do that for use on the VAX only.

Eric