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INI File | 1995-11-01 | 2.8 KB | 70 lines |
- [from EUUGN Vol.3 No.2]
-
- Compatibility Quiz
- Mike O'Carroll
- Microsystems Unit, Dept. of Electrical Engineering
- The University, Leeds LS2 9JT, England
-
- Herewith a super new quiz for all you 'DEC compatible' fans! Answers,
- on a postcard please, to the appropriate manufacturer. (N.B. to help
- those of you who have never gone to another supplier, our answers are
- included below.)
-
- QUESTIONS
- ---------
-
- Q1. What do you understand by the term 'DEC compatible'?
-
- Q2. What do you understand by the phrase '100%'?
-
- Q3 '[The controller gives] an emulation of all functional features of
- the DEC RJM02 subsystem'. Explain.
-
- Q5. 'Fully supported in this country!' [my exclamation rmark]. What is
- being supported here?
-
- Q6. Are DEC 100% compatible? Think about it.
-
- ANSWERS
- -------
-
- A1. Certain features, such as the code number of the product, general
- register layout, etc. are not totally dissimilar from those encountered
- in the DEC version.
-
- A2. Pick a number in the range from 0% - 90%. We award 90% to our
- current Emulex controllers which can do most things in a reasonably
- compatible manner (apart from minor things like multi-sector
- transfers). Dilog get a slightly lower mark for managing multi-sector
- transfers, but locking up completely if anything else tries an NPR at
- the sane time. DSD do slightly better now, having fixed the problem
- whereby the extended address counter went 00, 10, 01, 11, in
- 'ascending' order. Xylogics got 5% for an LSI-11 controller which
- managed to execute the bootstrap, but fell over as soon as it tried to
- write anything. A Spectralogics controller got 1% as it managed to read
- in the bootstrap, but failed to execute it. [If you find the last two
- hard to believe, ask the engineers who came to 'get it working in 10
- minutes, squire'.]
-
- A3. '... the maintenance mode features of the DEC RM02 controller is
- [sic] only partially emulated' - from the same manual as question.
- Presumably, 'maintenance mode' features are not 'functional' features.
- See also earlier correspondence in this august publication.
-
- A4. 'The diagnostics marked with an asterisk require certain patches'.
- See question.
-
- A5. The manufacture of telephone answering machines.
-
- A6. I've given enough away already. Work this one out for yourself.
-
- In order to stave off possible legal action, the author would like to
- point out that these comments (naturally) relate to our personal
- experiences with products made by the companies named. However, the
- points raised above have never been answered by those concerned (see
- question on support), so here's your chance folks! Incidentally,
- talking of legal action, here is a supplementary question:
-
- Q7. What, if anything, does the Trades Description Act have to say
- about terms like 'compatible'?
-