(puts on chip designer hat) this has long been a problem - even at the on-die level (that's what he ment by "worrying about data/clock skew").
Look on any mother board of the past 5-10 years - you'll see bunches of wiggly traces deliberatly lengthened to deal with just these problems.
I think that this thread has however become rather confused - parallel/serial vs. point-to-point/multidrop
On a multidrop bus you mjust meet setup.hold at every slot on the bus, you get nasty reflections that make this even harder to implement (look at the PCI spec for an example of wrestling with these problems) - point-to-point signals can be cleanly terminated and only have to be correct at one place - the other end of the bus the amount of skew can be greatly reduced
Inter-bit skew on a parallel bus has its own problems you have to meet setup/hold on every bit wrt the clock - that's a hard layout problem. You can solve this a lot of ways - bundling (ala EV6/AMD slot2k) where bits are bundled into smaller chunks with their own locks, or even at the extreme run a clock per bit, or use self-clocking protocols on each bit (wastes a little bandwidth). These techniques cost more gates and latency than the traditional methods - parallel isn't impossible, it's just a little harder
this is silly - Linux is world wide.... if the NSA/CIA/HSwhatsit decides to 'shutdown Linux' - Linus will probably just go back to Finland, Alan Cox will say "see I told you", and things will continue as before
ISC iis really a fron for CompTIA a software company pressure group (they represent the people who make money from software).
Amoung the thing that they do they offer various types of certifications to programmers. Strangely they offer Linux certification. I suggest that people boycott this program while the parent body continues to undermine open source world wide
I worked on the original A/UX kernel (the port wasn't done by Apple, they bought it) - it was V.2.2 (not V.3 or.4), licensed (via UniSoft) from AT&T (so you can't legally make a copy for your friend). It also had BSD 4.2/3 networking added to it.
Apple added to this a MacOS layer (all of the MacOS ran in a single A/UX process) - I was really impressed with the nifty job they did - if you look at the later A/UX releases when you walk up to a screen you have to look hard to figure out it's not a native MacOS box.
It only ran on 68k Macs, they let it die when they went to PPC - I still have a copy that boots, rumor is that there's an AUX DNS server still running somewhere in Europe. And of course I go to the A/UX user's group dinner at MacWorld every Jan.
Many years ago I worked for a company that was moving to a new office (a good thing) - it was at the end of a terrible commute, rather than no commute ( a bad thing), it was on top of an old oil tank farm and was going to get the air-humidifier's water from ground water (a really bad thing).
We let our misgivings be known... but I think the thing we did that really help0ed was we all updated our resumes, printed them out and left them on the laser printer for a day....
before "open source" was a well known name I ran an open source rocketry hardware/software project basicly you send me $33 and I sent you a baggy full of bits and a circuit board plus all the docs and software were freely available on the web site.
Having done that I known that writing flight code is HARD - not because the basic flight profile code is hard - for high power rockets it's not - it's hard because 95% of your code is error handling code that's hard to test - you don't even need a chunky cpu unless you're going to be doing real-time guidance sort of stuff - we used 8051s - the sort of thing that goes into toasters (but then 'cheap' was important to us - Murphy loves rockets - flight computers have to be easy to replace)
ummm - I'm not sure my point had anything to do with SCO or Linux... I think I was trying to put that particular comment (which I stared at over and over when I first ported V6 to another platform - untill it did become obvious) in context
yes - but b/* you are not expected to understand this */ predates not only GCC but modern C - it comes form a day when "i =+ 1" was the valid syntax (and "I += 1" was not). And where structure fields lived in their own global name space (don't ask - it let you implement unions in a particularly sad way)
no... maybe it's an attempt to take away the public welfare that govt use of.doc files confers upon MS.
What you say is only true if all you want to do is read it with your eyes - but If I want to import it into a spread sheet, or include portions of it in another text document (but keep the formatting, and include images and graphs), embed it in a web page (while reflowing around other stuff) etc etc
PDF is usefull but rather restricted in it's applications - and it too is controlled by a private entity. Better to have somethign more open and more flexible for public interchange
I've been a Unix/Linux kernel hack for more than 20 years now - Unix companies have been fragmenting Unix for years - law suits, too many standards etc etc
I suspect there are reall 2 good numbers for the number of owners of an OS platform - 0 and 1. With Linux we have the best of both worlds 1 because Linus gives us one true source, and 0 because we don't have to pay (M$ or anyone else) for it and have the source
Re:you *can* read the salon story freely...
on
SCO SCO SCO!
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· Score: 1
yeah - doesn't load in Konq either - silly Microsoft - they want people to switch to Windows but their ads only end up being seen by people who already have it
oh ... it's much more kafka ....
on
SCO SCO SCO!
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· Score: 2, Interesting
They wont let you see the NDA..... unless you sign an NDA on the NDA.....
I disagree - real 'architects' (I've held that job title in the past) understand this stuff really really well - or they fail.
If you are going to make those large system trade offs that are true architectural design you need to understand all of your subject and have made all the bad mistakes already (and learned by them of course).
Whether you're choosing the pipeline depth for a CPU, partitioning logic across clock domains, choosing chips for a board, designing data tructures for a large software project, etc etc you can't really do those things well unless you've worked in the trenches too - otherwise all you are is a poor architect
you must work in a wierd place where EEs design stuff but aren't expected to debug it and make it work once the board/chip comes back from the fab - us real engineers have to make stuff that not only works in the lab but yields at manufacture and works in the real world... of course we know how to solder, and hack a few resistors around when stuff doesn't work as expected
Robert's rules of order.... back in the early 80s I was involved in an anti-apartheid group in NZ - we bought shares in companies that imported things from South Africa. NZ law allows 100 stockholders to call a 'special general meeting' - the company had to do it within 6 weeks, then we could do it again, over and over again.
Everyone uses Roberts Rules of Order.... which are great - simply move something that requires a vote "I move a motion of no confidence in the chair under the 1906 senility act" or "I move that there be no smoking in the room" - then have a bunch of others disagree - force a vote - demand written ballots - if they insist on a voice vote demand a vote on that.... and demand written ballots.... if they don't agree keep recursing on votes on written ballots - otherwise on to step 2 - challenge the scruiteneers for the written ballot - demand a vote (even put up 2 competing planks) - demand a written ballot on scruiteneers, recurse for ever...
We did this once in an AGM managed to have a motion of no confidence in the chair illegally squashed which ment that the companies books were not legally adopted and they were in position where a shareholders suit could have stopped them trading dead.
These meetings were so much fun - old guys in suits who were used to having an AGM once a year where 2 other guys would show up and ask why the dividend wasnt as high as last year, then they'd all retire for a sherry. They were faced with 100 really pissed shareholder with a game plan... faced with this the chairman turned so red in the face and got so angry I swear I thought he was going to explode....
Now if only the US had the same small shareholder protection laws that NZ does we could all power on down to SCO and have some fun....
For the city of Santa Cruz to get SCO (based in Orem Utah) to stop using their name
Re:The quarter is hard enough
on
Making Change
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· Score: 1
yeah - moving to the US was hard - the first time I was given a quarter and a dime for 35c I had to really think about it. A lot of it is what you're used to.
I guess it's historical and certain stick-in-th-mud attitude that americans have to their currency (no we wont use a $2 note, we dont understand it even though we use $20 notes all the time) - most other western countries seem to revamp their currencies every couple of decades and as a result have systems that are much more internally consistant - mostly based on progressions of 1/2/5 or 1/2.5/5 (with the occasional 1/3/5 of course). The US has this strange amalgam of both that does 1/5/10/25/50/1/(2)/5/10/20/50/100 and makes new comers shake their heads in unbelief
if it doubles every 9 months fopr 27 months it's its 2^(27/9)=8 time not 2*(27/9)=6 time.
In fact Moore's law sais it's 2^(N/18) (doubles roughly every 18 months) - so 2^(27/18) = ~ 6 times.... which means that IPod disk size (for one sample) is following Moore quite nicely....
It's trademark was removed from Bayer by the Allies as part of the WW1 reparations against Germany. 10 points for knowing the other trademark that was taken....
no - it's way out of the ball park - those $16 are paying for store leases, surly employees who mlook down at your choice of music, CDs, liner notes, jewel cases, trucks to move them around, warehouses, pilferage, inventory costs etc etc
An online bits-only music store has none of these - $1 might be an OK price for a hit - but not for the other 15 tracks on the album. All up I think an online-only album is more fairly priced somewhere in the $5-$8 space
write off your phone lines, net connections, pro-rate your power, heating, insurance, water, rent (but not your property tax or morgage interest, you can't claim them twice) etc etc make sure yopu keep good records and create a written explanation of how you did it BEFORE you file your taxes you you have a hope-in-hell of explaining it if you're audited.
You can also write off capital items like chairs and computers, the a minimum lumpsum per year which you may fall under (makes it easier) otherwise you'll need tax help to figure out amortizations (still worth it).
Slashdot Mirror
Look on any mother board of the past 5-10 years - you'll see bunches of wiggly traces deliberatly lengthened to deal with just these problems.
I think that this thread has however become rather confused - parallel/serial vs. point-to-point/multidrop
On a multidrop bus you mjust meet setup.hold at every slot on the bus, you get nasty reflections that make this even harder to implement (look at the PCI spec for an example of wrestling with these problems) - point-to-point signals can be cleanly terminated and only have to be correct at one place - the other end of the bus the amount of skew can be greatly reduced
Inter-bit skew on a parallel bus has its own problems you have to meet setup/hold on every bit wrt the clock - that's a hard layout problem. You can solve this a lot of ways - bundling (ala EV6/AMD slot2k) where bits are bundled into smaller chunks with their own locks, or even at the extreme run a clock per bit, or use self-clocking protocols on each bit (wastes a little bandwidth). These techniques cost more gates and latency than the traditional methods - parallel isn't impossible, it's just a little harder
this is silly - Linux is world wide .... if the NSA/CIA/HSwhatsit decides to 'shutdown Linux' - Linus will probably just go back to Finland, Alan Cox will say "see I told you", and things will continue as before
Amoung the thing that they do they offer various types of certifications to programmers. Strangely they offer Linux certification. I suggest that people boycott this program while the parent body continues to undermine open source world wide
Apple added to this a MacOS layer (all of the MacOS ran in a single A/UX process) - I was really impressed with the nifty job they did - if you look at the later A/UX releases when you walk up to a screen you have to look hard to figure out it's not a native MacOS box.
It only ran on 68k Macs, they let it die when they went to PPC - I still have a copy that boots, rumor is that there's an AUX DNS server still running somewhere in Europe. And of course I go to the A/UX user's group dinner at MacWorld every Jan.
We let our misgivings be known ... but I think the thing we did that really help0ed was we all updated our resumes, printed them out and left them on the laser printer for a day ....
Having done that I known that writing flight code is HARD - not because the basic flight profile code is hard - for high power rockets it's not - it's hard because 95% of your code is error handling code that's hard to test - you don't even need a chunky cpu unless you're going to be doing real-time guidance sort of stuff - we used 8051s - the sort of thing that goes into toasters (but then 'cheap' was important to us - Murphy loves rockets - flight computers have to be easy to replace)
ummm - I'm not sure my point had anything to do with SCO or Linux ... I think I was trying to put that particular comment (which I stared at over and over when I first ported V6 to another platform - untill it did become obvious) in context
yes - but b/* you are not expected to understand this */ predates not only GCC but modern C - it comes form a day when "i =+ 1" was the valid syntax (and "I += 1" was not). And where structure fields lived in their own global name space (don't ask - it let you implement unions in a particularly sad way)
What you say is only true if all you want to do is read it with your eyes - but If I want to import it into a spread sheet, or include portions of it in another text document (but keep the formatting, and include images and graphs), embed it in a web page (while reflowing around other stuff) etc etc
PDF is usefull but rather restricted in it's applications - and it too is controlled by a private entity. Better to have somethign more open and more flexible for public interchange
I suspect there are reall 2 good numbers for the number of owners of an OS platform - 0 and 1. With Linux we have the best of both worlds 1 because Linus gives us one true source, and 0 because we don't have to pay (M$ or anyone else) for it and have the source
yeah - doesn't load in Konq either - silly Microsoft - they want people to switch to Windows but their ads only end up being seen by people who already have it
They wont let you see the NDA ..... unless you sign an NDA on the NDA .....
If you are going to make those large system trade offs that are true architectural design you need to understand all of your subject and have made all the bad mistakes already (and learned by them of course).
Whether you're choosing the pipeline depth for a CPU, partitioning logic across clock domains, choosing chips for a board, designing data tructures for a large software project, etc etc you can't really do those things well unless you've worked in the trenches too - otherwise all you are is a poor architect
you must work in a wierd place where EEs design stuff but aren't expected to debug it and make it work once the board/chip comes back from the fab - us real engineers have to make stuff that not only works in the lab but yields at manufacture and works in the real world ... of course we know how to solder, and hack a few resistors around when stuff doesn't work as expected
Everyone uses Roberts Rules of Order .... which are great - simply move something that requires a vote "I move a motion of no confidence in the chair under the 1906 senility act" or "I move that there be no smoking in the room" - then have a bunch of others disagree - force a vote - demand written ballots - if they insist on a voice vote demand a vote on that .... and demand written ballots .... if they don't agree keep recursing on votes on written ballots - otherwise on to step 2 - challenge the scruiteneers for the written ballot - demand a vote (even put up 2 competing planks) - demand a written ballot on scruiteneers, recurse for ever ...
We did this once in an AGM managed to have a motion of no confidence in the chair illegally squashed which ment that the companies books were not legally adopted and they were in position where a shareholders suit could have stopped them trading dead.
These meetings were so much fun - old guys in suits who were used to having an AGM once a year where 2 other guys would show up and ask why the dividend wasnt as high as last year, then they'd all retire for a sherry. They were faced with 100 really pissed shareholder with a game plan ... faced with this the chairman turned so red in the face and got so angry I swear I thought he was going to explode ....
Now if only the US had the same small shareholder protection laws that NZ does we could all power on down to SCO and have some fun ....
For the city of Santa Cruz to get SCO (based in Orem Utah) to stop using their name
I guess it's historical and certain stick-in-th-mud attitude that americans have to their currency (no we wont use a $2 note, we dont understand it even though we use $20 notes all the time) - most other western countries seem to revamp their currencies every couple of decades and as a result have systems that are much more internally consistant - mostly based on progressions of 1/2/5 or 1/2.5/5 (with the occasional 1/3/5 of course). The US has this strange amalgam of both that does 1/5/10/25/50/1/(2)/5/10/20/50/100 and makes new comers shake their heads in unbelief
In fact Moore's law sais it's 2^(N/18) (doubles roughly every 18 months) - so 2^(27/18) = ~ 6 times .... which means that IPod disk size (for one sample) is following Moore quite nicely ....
you're an AC - no points for you
10 points
It's trademark was removed from Bayer by the Allies as part of the WW1 reparations against Germany. 10 points for knowing the other trademark that was taken ....
RTFA .... the original race started in Arcata in 1969
yes .... but 20 years ago it was different, small, engaged, spamfree etc etc wonders abounded, I really miss it
An online bits-only music store has none of these - $1 might be an OK price for a hit - but not for the other 15 tracks on the album. All up I think an online-only album is more fairly priced somewhere in the $5-$8 space
You can also write off capital items like chairs and computers, the a minimum lumpsum per year which you may fall under (makes it easier) otherwise you'll need tax help to figure out amortizations (still worth it).