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- Newsgroups: comp.sys.dec.micro
- Path: sparky!uunet!utcsri!torn!watserv2.uwaterloo.ca!watdragon.uwaterloo.ca!kcwellsc
- From: kcwellsc@watdragon.uwaterloo.ca (Ken Wellsch)
- Subject: Re: Pro/Venix Installation
- Message-ID: <BttDwA.579@watdragon.uwaterloo.ca>
- Organization: University of Waterloo
- References: <1992Aug29.194138.12101@news.columbia.edu> <Bts2CG.MM0@watdragon.uwaterloo.ca> <1992Aug30.055216.23265@news.columbia.edu>
- Date: Sun, 30 Aug 1992 20:50:33 GMT
- Lines: 19
-
- >I have heard some of this before, all too fuzzy though.
- >
- >I have seen actual DEC RD51 drives that come with metallic cutable jumpers on
- >the DS lines. DS0, DS1, DS2 are intact and DS3 is cut. This means that this
- >particular drive will select on 0 or 1 or 2 but not 3. I have been told that
- >the reason for cutting the DS3 line is that in (presumably one of the PRO
- >models, because it ain't a DECmate or RB), the controller uses the incompatible
- >notion of *reading* back DS3 instead of potentially asserting it. Thus, a
- >5 Meg has the DS3 set and a 10 Meg has it clear, so the machine "knows" what
- >size disk it is. (This is back when there only were RD50 and RD51 supported.)
- >
- >Is there anything to this?
-
- I don't know. I can only mention what my docs have. The Pro pocket service
- guide says to cut the "fourth from the back of the drive" jumper. They've
- used a seven jumper dip leaving the 8th (toward the front of the drive) empty.
- I don't have the Seagate info to know what the jumpers do. My old uVAX-1
- docs say to cut the back two and the fourth (as for the Pro). I've forgotten
- what the setting for the RD50 is, possibly all jumpered.
-