To those who have kids... Have you ever tried to help them with their math homework? Not so easy, is it?
The problem is that some things become so instictive that you can't explain them properly, you "just know" them. I can't help my daughter with her math homework probably for another three or four years, at which point she'll have the requisite base knowledge that I can discuss things with her.
It's sad, but the old saw "those who can..." is probably true, and not in the insulting way it's usually used.
I disagree. Consider this: Who would you rather have coaching you at Basketball? Michael Jordan, or Kurt Rambis?
I doubt that Jordan would be able to explain how to do stuff... it's too natural and instictive to him. Rambis, on the other hand, IIRC, had to work hard at it.
I have the same problem when it comes to helping my daughter with her math homework. I can't help her because I can't explain how to do it. I just do the problems instinctively. I send her to her mom, or to our next door neighbor (who is a math teacher).
I wonder if this is a case where the old saw actually works out better... "Those who can, do. Those who can't do, teach".
Man, lots of fond reminiscing here about the Z80 (and clones). Quite rightly, too... the Z80 was a fun little beast.
Zilog, however, made lots of other stuff. Some were moderately successful (Z8530 SCC), some not so (Z8000 MPU).
The Z8000 actually was fairly popular in military applications until COTS took over. I seem to recall many avionics systems used it. When it came out, it was comparable to the 68K.
It had 16 16bit registers (r0-r15), each of which could be addressed as 2 8-bit registers (rhN, rlN). R15 was the stack pointer. Nice orthagonal instruction set, with logical block moves (similar to the Z80 LDIR instruction), as compared to the intel REP instructions...
The registers could be doubled up into 32-bit registers (rr0, rr2,... rr14). The Z8001 and Z8003 were "segmented", but they used a reasonable segmentation model to achieve 8M memory...
The low 16 bits were the offset in the segment, and the high 7 bits were the segment number. So, you essentially had 23 bit addressing. Of course, the way you generated segmented addresses was a tad odd... I believe bits 30:24 were the segement number in a 32-bit address.
Only problem was, they never got the Z8070 FPU working. Bummer.
Just a short comment, it's "NSC800", not "NCS800".
I used to program the NSC beasties. They were code (but not pin) compatible with the Z80. What they had was three extra RST (interrupt) lines -- RSTA, RSTB, and RSTC, as well as the standard RST. You used port 0BBH to mask those on or off individually. The only problem was that 0BBH was write only, so you had to shadow it.
Roadrunner is probably financially OK for the same reason that Verizon, SBC, and Qwest are financially OK.
They own the lines they're providing broadband over. Northpoint, Rhythms, Covad, etc... all had to get the lines FROM A COMPETITOR (no conflict of interest here, people, move along).
So unless someone is stupid enough to try and sneak a bomb onto a plane in one of these spheres, it's not much use to the security guards
Reminds me of the old joke...
In the early days of Rocket Science(tm), they were trying to figure out how to protect the astronaut from acceleration. So they hired one of the leading physicists of the day to investigate.
A month later, he came back with a solution. He got up in front of the NASA bigwigs, and said, "First, assume a perfectly spherical astronaut..."
In some areas, particularly National Security areas, we should give the SAs the ability to take well-defined countermeasures to counteract attacks, including tracing DoS attacks and making contact with their sources.
This is what Cliff Stoll did when nobody gave a damn during the German Hacker incident. Except, of course, they weren't DoS attacks, there were r00ting.
I wonder what would have happened with that investigation in today's climate? Would he have been sued for allowing the hacker to run free? What would law enforcement have done? IIRC, the only TLA that paid attention to him was the CIA.
And, along the same lines, may we suggest that you take Sen. Hollings out by the woodshed and whack him with a cluestick until he drops any remote thoughts of introducing the SSSCA?
Dude, perhaps you have heard of the website that generally runs during the Olympics? You know, the one that gives (semi-)realtime results, so you don't have to wait five days for NBC to get its act together?
The Spielberg story may be an urban legend... I seem to recall having heard it too...
I used to work for a defense contractor, in a classified area. Access list was need-to-know, and visitors were to be escorted at all times. Policy was to challenge all unknown people. Someone once challenged the division president (no, he wasn't on the list... no need-to-know), and got an attaboy for it.
Slashdot Mirror
What, in your opinion, are the chances of getting the DMCA declared unconstitutional?
Given the recent court defeats in both the Felten and 2600 cases, do we even have a chance?
I don't know, I don't use PayPal.
BUT... The people behind the web site have been spamming Usenet with multiple warnings, using bogus email addresses. I'd take it with a grain of salt.
This dude has it right on the head.
To those who have kids... Have you ever tried to help them with their math homework? Not so easy, is it?
The problem is that some things become so instictive that you can't explain them properly, you "just know" them. I can't help my daughter with her math homework probably for another three or four years, at which point she'll have the requisite base knowledge that I can discuss things with her.
It's sad, but the old saw "those who can..." is probably true, and not in the insulting way it's usually used.
I disagree. Consider this: Who would you rather have coaching you at Basketball? Michael Jordan, or Kurt Rambis?
I doubt that Jordan would be able to explain how to do stuff... it's too natural and instictive to him. Rambis, on the other hand, IIRC, had to work hard at it.
I have the same problem when it comes to helping my daughter with her math homework. I can't help her because I can't explain how to do it. I just do the problems instinctively. I send her to her mom, or to our next door neighbor (who is a math teacher).
I wonder if this is a case where the old saw actually works out better... "Those who can, do. Those who can't do, teach".
How about my favorite block fill:
XOR A, A
LD HL, 4000H ; start of your buffer
LD (HL), A
LD DE, 4001H ; next after HL
LD BC, 0FFFH ; buf len - 1
LDIR
I thought so, but couldn't remember for sure, and didn't want to get flamed for a wrong answer.
EX AF, AF'
EXX
; put your interrupt handling code here
EXX
EX AF, AF'
RETI
Man, lots of fond reminiscing here about the Z80 (and clones). Quite rightly, too... the Z80 was a fun little beast.
... rr14). The Z8001 and Z8003 were "segmented", but they used a reasonable segmentation model to achieve 8M memory...
Zilog, however, made lots of other stuff. Some were moderately successful (Z8530 SCC), some not so (Z8000 MPU).
The Z8000 actually was fairly popular in military applications until COTS took over. I seem to recall many avionics systems used it. When it came out, it was comparable to the 68K.
It had 16 16bit registers (r0-r15), each of which could be addressed as 2 8-bit registers (rhN, rlN). R15 was the stack pointer. Nice orthagonal instruction set, with logical block moves (similar to the Z80 LDIR instruction), as compared to the intel REP instructions...
The registers could be doubled up into 32-bit registers (rr0, rr2,
The low 16 bits were the offset in the segment, and the high 7 bits were the segment number. So, you essentially had 23 bit addressing. Of course, the way you generated segmented addresses was a tad odd... I believe bits 30:24 were the segement number in a 32-bit address.
Only problem was, they never got the Z8070 FPU working. Bummer.
Just a short comment, it's "NSC800", not "NCS800".
I used to program the NSC beasties. They were code (but not pin) compatible with the Z80. What they had was three extra RST (interrupt) lines -- RSTA, RSTB, and RSTC, as well as the standard RST. You used port 0BBH to mask those on or off individually. The only problem was that 0BBH was write only, so you had to shadow it.
I wrote I/O drivers for a military system that used Z80s (actually the NSC-800 clone thereof) as I/O slaves. I loved the mirror registers!
The Binary watch from RSI -- Perfect for the geek with RSI!
Or will you just get carpal tunnel syndrome from wearing it?
Dude, now CmdrTaco's gonna get nailed for your link!!!!!
Roadrunner is probably financially OK for the same reason that Verizon, SBC, and Qwest are financially OK.
They own the lines they're providing broadband over. Northpoint, Rhythms, Covad, etc... all had to get the lines FROM A COMPETITOR (no conflict of interest here, people, move along).
is some really big cats, so they can get some exercise (US Patent 5,443,036)
So unless someone is stupid enough to try and sneak a bomb onto a plane in one of these spheres, it's not much use to the security guards
Reminds me of the old joke...
In the early days of Rocket Science(tm), they were trying to figure out how to protect the astronaut from acceleration. So they hired one of the leading physicists of the day to investigate.
A month later, he came back with a solution. He got up in front of the NASA bigwigs, and said, "First, assume a perfectly spherical astronaut..."
In some areas, particularly National Security areas, we should give the SAs the ability to take well-defined countermeasures to counteract attacks, including tracing DoS attacks and making contact with their sources.
This is what Cliff Stoll did when nobody gave a damn during the German Hacker incident. Except, of course, they weren't DoS attacks, there were r00ting.
I wonder what would have happened with that investigation in today's climate? Would he have been sued for allowing the hacker to run free? What would law enforcement have done? IIRC, the only TLA that paid attention to him was the CIA.
MOD THIS GUY UP!
And, along the same lines, may we suggest that you take Sen. Hollings out by the woodshed and whack him with a cluestick until he drops any remote thoughts of introducing the SSSCA?
Dude, perhaps you have heard of the website that generally runs during the Olympics? You know, the one that gives (semi-)realtime results, so you don't have to wait five days for NBC to get its act together?
We'll take 'em! The last time we had them here in L.A., the traffic got BETTER, not worse!!!!!
That's because the Olympics were religious in nature, and the gods would nail their asses to the wall if they messed with them.
Today, you've got people who want to kill in the name of G-d, so of course they'll try to mess with the Olympics.
The Spielberg story may be an urban legend... I seem to recall having heard it too...
... no need-to-know), and got an attaboy for it.
I used to work for a defense contractor, in a classified area. Access list was need-to-know, and visitors were to be escorted at all times. Policy was to challenge all unknown people. Someone once challenged the division president (no, he wasn't on the list
But that discriminates against suits and marketroids, since they don't have brains!
Arwen.
I hope, at least, that they get the design of the Weirding Modules directly from the book this time.
There ARE NO FUCKING WIERDING MODULES IN THE BOOK!!!!!
The umount thing was a bug in 2.4.15.
Difference. It's not illegal to manufacture razor blades. Under DMCA, it's illegal to manufacture "circumvention devices".