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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!wupost!gumby!yale!yale.edu!ira.uka.de!chx400!bernina!torda
- From: torda@igc.ethz.ch (Andrew Torda)
- Subject: HAPPY ENDING: dials+buttons, stereo, DB-9 or DIN-8
- Message-ID: <1992Jul21.131037.10213@bernina.ethz.ch>
- Keywords: dials and buttons, stereo, serial, DB-9, DIN-8
- Sender: news@bernina.ethz.ch (USENET News System)
- Organization: Computational Chemistry, ETH, Zuerich
- References: <1992Jul16.070217.28684@bernina.ethz.ch>
- Date: Tue, 21 Jul 1992 13:10:37 GMT
- Lines: 38
-
- Some days ago I asked about the feasibility of getting both a
- dials+buttons and stereo viewer working on a 4d/310.
- The complications were that:
- 1. Both devices need a power supply as well as serial line
- signals.
- 2. SGI have, apparently, sold two kinds of d+b box. One had a
- seperate power supply, the other expected to get its power
- from the extra line brought to the front of the 4d/310 through
- the din-8 plug (not present on db-9 connectors).
- SGI had delivered a d+b box to us which did not have a
- seperate power supply.
- 3. The owners guide says that only the first two (of four)
- serial ports carry any signals.
- 4. Both devices need power, but only one of the first of the
- two serial ports has the din-8 plug with the extra power.
-
- The cure was found by luck, not knowledge.
- a) stick the d+b box on com2 using the din-8 connector.
- b) Now how to get both power and signal to the stereo viewer ?
- The manual clearly states
- "Single processor systems support... two 9-pin D-sub serial
- connectors and *one* 8-pin DIN connector; signal is not
- provided to connector pairs 3 and 4."
- Despite me reading the manual to SGI, the Zurich men insisted
- on plugging the stereo viewer into the DIN-8 plug on com3.
- To my surprise, the thing worked.
-
- Explanation ?
- I asked the men and they theorised that although the standard
- serial lines might not be wired up on com3, the power and
- stereo sync lines were.
- Witchcraft, but it did work.
-
- Thanks to the people who posted/mailed suggestions about power
- packs, bifurcated cables and so on.
- -Andrew
- --
- Andrew Torda, Computational Chemistry, ETH, Zurich, torda@igc.ethz.ch
-