<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>Nows your chance to make it happen! </div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Galaxy Tab® A</div></div><div><br></div><div style="font-size:100%;color:#000000"><!-- originalMessage --><div>-------- Original message --------</div><div>From: Rich Alderson <simh@alderson.users.panix.com> </div><div>Date: 3/7/17 12:37 PM (GMT-07:00) </div><div>To: simh@trailing-edge.com </div><div>Subject: Re: [Simh] CI750 tech docs and VAX firmware </div><div><br></div></div>> From: Johnny Billquist <bqt@softjar.se><br>> Date: Tue, 7 Mar 2017 00:47:08 +0100<br><br>> On 2017-03-06 15:03, Timothe Litt wrote:<br><br>>> At some point, support for 18-bit disks (576 byte sectors) was dropped. The<br>>> HSC50 definitely had it; the HSC90 did not. I'm unsure about the HSC70.<br><br>> Unless I remember totally wrong, only the HSC50 could do 576 byte sectors.<br>> It was dropped in a pretty early version of CRONIC, before support for any<br>> other HSC controller existed.<br><br>Correct. Only the HSC50 ever supported 576-byte sectors, and only on RA81 and<br>smaller drives. (We really wanted RA82s on our 4-system CI cluster at Stanford<br>LOTS, but were informed that it would never ever happen.)<br><br> Rich<br>_______________________________________________<br>Simh mailing list<br>Simh@trailing-edge.com<br>http://mailman.trailing-edge.com/mailman/listinfo/simh</body></html>