Getting an ST-225 disk to work

> -----Original Message----- > From: cctalk-bounces at classiccmp.org [mailto:cctalk- > bounces at classiccmp.org] On Behalf Of Jerome H. Fine > Sent: 31 December 2012 00:16 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Getting an ST-225 disk to work > > >emanuel stiebler wrote: > >>> On 2012-12-30 14:18, Rob Jarratt wrote: >>> I have a Seagate ST-225 that I want to put into my Micro PDP-11/73. >>> At the >>> moment I am just trying to see if the disk works at all and if I can >>> format it in a MicroVAX 2000. It spins up but the TEST 70 and TEST 71 >>> commands fail on it, unable to determine the type of disk. There are >>> some jumpers for which I have found some documentation here: >>> http://stason.org/TULARC/pc/hard-drives-hdd/seagate/ST225-21MB-5- > 25-H >>> H-MFM-S >>> >>> T412.html, but I am not sure which is pin 1, and I am not sure what >>> settings the MicroVAX 2000 wants, or if it needs the resistor >>> termination pack.

>>> >>> Can anyone tell me which jumper settings I need for the disk to work >>> in a 2000? And whether I need the resistor pack installed? >> AFAIRC, it should have the resistors in, as it is at the end of the >> cable. And it should be recognized by the TEST70, or it was used on a >> different system. Is it labeled as a rd31? Probably you have to do a >> real low level format, entering all the right parameters in the TEST70 >> yourself . > Whenever I have used any RD5n or RD3n drive with the > RQDX3 controller on the PDP-11, the drive always had be be DS3. > > I don't know if the MSCP controller is built into the MicroVAX 2000, but I > suspect that DS3 is so standard with DEC that all MSCP RD3n drives must be > DS3 in a DEC system.