| --- Log opened Sat Oct 20 00:00:26 2007 |
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| 11:48 | | gnolam is now known as gnolameeting |
| 13:02 | <@AnnoDomini> | Hm. I wonder - is it possible to set up a specific 404 page for different portions of a website, under Apache? |
| 13:04 | < GeekSoldier> | Ithink I've seen it done. |
| 13:06 | <@jerith> | AnnoDomini: |
| 13:06 | <@AnnoDomini> | Whaaaat? |
| 13:07 | <@jerith> | AnnoDomini: It is. I can't remember how, though. |
| 13:09 | | * AnnoDomini ponders just how to delete a specific line in a textfile from mIRC. |
| 13:11 | <@jerith> | system("sed -i /path/to/text/file '/regex to match line/d'"); |
| 13:12 | <@AnnoDomini> | That's not mIRC. |
| 13:12 | <@jerith> | Does mirc let you shell out? |
| 13:13 | <@jerith> | I'm sure there's a cygwin sed... |
| 13:13 | <@AnnoDomini> | Shell out? Que? |
| 13:14 | <@jerith> | Run an external program. |
| 13:15 | <@AnnoDomini> | Don't think so. |
| 13:40 | | You're now known as TheWatcher |
| 14:36 | <@ToxicFrog> | /exec? |
| 14:36 | <@ToxicFrog> | I'm fairly sure it does, since I've seen mIRCscript worms that exploit that capability |
| 15:20 | <@AnnoDomini> | Hrm. It seems that I can overwrite. Any idea how to use overwriting to delete things? |
| 15:21 | < MyCatVerbs> | Heh. You can certainly truncate. :) |
| 15:22 | <@AnnoDomini> | Hm. I just might skip this step. |
| 15:22 | <@AnnoDomini> | Call it a feature. |
| 15:36 | <@AnnoDomini> | Hm. The memo archive shouldn't trigger notices. I think I'll replace normal characters with nearequivalents that aren't allowed as nicknames. |
| 15:59 | | * AnnoDomini yays at a custom multimemo script. Now to hook it up to a trigger. |
| 16:00 | <@jerith> | http://programming.reddit.com/info/5yg9s/comments/c029p5m?context=1 |
| 16:08 | <@AnnoDomini> | Yay. It works. Now any number of people can receive memos from me, not just one at a time. |
| 16:14 | <@AnnoDomini> | jerith: Hilarious. |
| 16:25 | | * MyCatVerbs wonders what the general consensus among proggit readers is on qwe1234. |
| 16:26 | | * jerith seldom reads comments. |
| 16:43 | <@AnnoDomini> | Hm. In sign-magnitude notation, it is easy to obtain the modulus of a binary number - simply by doing a left shift and then a right shift. Does this also hold true for 2C numbers? |
| 16:45 | < MyCatVerbs> | Nope. |
| 16:46 | < MyCatVerbs> | -1 in sixteen-bit 2C == 0xffff. Not what you're after at all. |
| 16:46 | < MyCatVerbs> | You need to negate iff the high bit is set. In software you usually just do abs(a). |
| 16:47 | <@AnnoDomini> | Just negate? Okay. |
| 16:47 | < MyCatVerbs> | As in, invert then add one. |
| 16:47 | <@AnnoDomini> | Ah. |
| 16:47 | < MyCatVerbs> | I think x86 has a single instruction to do that, for various sizes of integer. |
| 16:50 | <@AnnoDomini> | Well, this isn't x86. |
| 16:50 | < MyCatVerbs> | What is it? |
| 16:51 | <@AnnoDomini> | Am2900. |
| 16:53 | | * MyCatVerbs looks that up. |
| 16:54 | < MyCatVerbs> | ...what? Roll-your-own-ALU? |
| 16:54 | <@AnnoDomini> | Pardon? |
| 16:55 | < MyCatVerbs> | You're building your own hardware? |
| 16:56 | < MyCatVerbs> | Hrmn. Those must've been blazingly fast, back in the day. |
| 16:57 | <@AnnoDomini> | We're just beginning to muck with this. I wouldn't know where to begin in making a processor. |
| 16:57 | < MyCatVerbs> | Heh. |
| 17:03 | <@AnnoDomini> | Let it be noted that I frown upon the teaching methods implemented in the two courses about assembler programming. "U can has simulator. I can has 150 line program next week? Bai, cya then." |
| 17:05 | <@ToxicFrog> | On the 6812, assuming you have it in A, it's nega; inca; |
| 17:11 | < MyCatVerbs> | ToxicFrog: what? Integer negation is two instructions? |
| 17:12 | | You're now known as TheWatcher[afk] |
| 17:13 | | * AnnoDomini is reminded of "What! A human in a Precursor service vehicle?" |
| 17:35 | <@ToxicFrog> | Yes,. |
| 17:35 | <@ToxicFrog> | A bitwise NOT, then you add one. |
| 17:37 | | * AnnoDomini twirls his moustach as he reads what he'll need to do on the next Computer Architecture class, on Monday. |
| 17:37 | <@AnnoDomini> | Does anyone know how a 8086 physical (effective) address is constructed? |
| 17:38 | <@ToxicFrog> | Heh. We finished designing the instruction set last week, and now have two weeks to finish designing the CPU internals. |
| 17:38 | <@ToxicFrog> | No clue! |
| 17:56 | < MyCatVerbs> | AnnoDomini: the original 8086? I think that just used raw physical addresses. |
| 17:56 | <@AnnoDomini> | Explain, please? |
| 17:56 | < MyCatVerbs> | ToxicFrog: why not have just one instruction for it? |
| 17:56 | < MyCatVerbs> | AnnoDomini: as in, no mmap() syscalls. I thought the 8086 did literally *no* address translation? Might be wrong. |
| 17:57 | <@ToxicFrog> | MyCatVerbs: because the 6812 is a tiny, tiny thing with no explicit support for signed math? |
| 17:57 | <@ToxicFrog> | By tiny, we're talking one accumulator, two index registers, SP, PC, and eight flag bits. |
| 17:57 | <@ToxicFrog> | And under 300 instructions. |
| 17:57 | < MyCatVerbs> | ToxicFrog: nice. |
| 17:58 | <@AnnoDomini> | MyCatVerbs: I meant, do you know how the physical is done? I have no idea what this is about. |
| 17:58 | <@ToxicFrog> | Which is still stupid huge compared to the one we're designing (7 registers, PC, 4 flag bits, 21 instructions) |
| 17:59 | < MyCatVerbs> | AnnoDomini: what? Physical addresses are the numbers that you stick on the address bus when you're telling the RAM what to hit you up with next. |
| 18:01 | <@AnnoDomini> | Okay. But I'm a complete neophyte. As I said, they just give us a simulator and tell us to deliver a completed program. We barely get taught anything at all. This teacher is nice enough to give us a 'what you need to know' paper. The paper says we need to know how 8086 physical addresses are constructed. I do not actually know what that means. :/ |
| 18:01 | | Vornicus-Latens [~vorn@Admin.Nightstar.Net] has quit [Ping Timeout] |
| 18:02 | < MyCatVerbs> | Oh. Perhaps it's something more complicated then. |
| 18:03 | <@AnnoDomini> | A more literal translation is "the way of making physical addresses (effective addresses) in the 8086 processor". |
| 18:05 | < MyCatVerbs> | Perhaps you might be able to find an 8086 manual somewhere. |
| 18:06 | < MyCatVerbs> | Oh, wait, no. |
| 18:06 | < MyCatVerbs> | 8086 has the 20-bit-addressing trick. |
| 18:07 | <@AnnoDomini> | Oh? |
| 18:07 | | * AnnoDomini goes AFW for a while. |
| 18:08 | < MyCatVerbs> | Go find a CPU manual, srsly. |
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| 18:26 | <@AnnoDomini> | Okay. |
| 18:30 | <@AnnoDomini> | My google-fu is failing, so far. :( |
| 18:38 | <@ToxicFrog> | Wait, they have you using the 08086? |
| 18:39 | <@ToxicFrog> | You poor, poor soul |
| 18:40 | <@AnnoDomini> | ToxicFrog: No. We're emulating a 8086 on a Am2900 simulator. |
| 18:42 | | * MyCatVerbs shudders. |
| 18:42 | < MyCatVerbs> | That is nasty. |
| 18:43 | <@ToxicFrog> | And this is better...how? |
| 18:47 | < MyCatVerbs> | This? |
| 18:51 | | gnolameeting is now known as gnolam |
| 20:06 | <@AnnoDomini> | It is not better. |
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| 20:55 | <@gnolam> | 8086? Your professors are seriously /evil/. |
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| 21:16 | <@ToxicFrog> | Yeah. |
| 21:16 | <@ToxicFrog> | We got to use the 68K. |
| 21:21 | | * gnolam too. |
| 21:21 | <@gnolam> | And the 68k is a schweet architecture. |
| 21:23 | <@jerith> | We did 8052 and PIC. |
| 21:23 | <@jerith> | Umm, 805 |
| 21:23 | <@jerith> | Gah! |
| 21:23 | <@jerith> | *8051* |
| 21:24 | <@gnolam> | I bid 8053! |
| 21:24 | <@jerith> | Both are pretty horrible, the latter moreso. |
| 21:24 | <@jerith> | AVRs are cool, though. |
| 21:24 | <@gnolam> | Yeah. I much prefer AVR to PIC. |
| 21:25 | <@gnolam> | The AVR instruction set is a bit bloated, but at least it's not the plain /mess/ that PIC is. |
| 21:26 | <@gnolam> | (The Killer Robot uses AVRs exclusively) |
| 21:29 | <@ToxicFrog> | AVR? |
| 21:29 | <@jerith> | Atmel's 8-bit micro. |
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| 23:28 | <@AnnoDomini> | It's funny how /fseek says it fails when I attempt to point it at line $lines+1, but somehow does what I want it to - sets the pointer as far as it can, so I can append stuff without fuss. |
| 23:33 | <@ToxicFrog> | ...odd. That doesn't match the behaviour of fseek or lseek. |
| 23:33 | <@AnnoDomini> | Are we both talking about mIRC? |
| 23:36 | <@ToxicFrog> | Well, I'm talking about the underlying system calls /fseek is almost certainly implemented in terms of - fseek(3) and lseek(2) |
| 23:36 | <@ToxicFrog> | Although, on further considering, fseek() doesn't specify what happens if you try to seek past the end, and the windows equivalent of lseek() probably doesn't have the same contract, so. |
| 23:36 | <@AnnoDomini> | What's lseek? |
| 23:38 | <@ToxicFrog> | The low-level system call that fseek() is a wrapper for. |
| 23:39 | <@ToxicFrog> | According to the man page, attempting to seek past the end of a device will fail, but attepting to seek past the end of a file will succeed, and should you write while the pointer is positioned past the end, the intervening space will be filled with nulls. |
| 23:39 | <@AnnoDomini> | I see. What I wanted for the fseek to do was to go to the last line. Notably, there is a $crlf at the end of the penultimate line, so I figured it should find the last one I'm able to put a cursor on. |
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| --- Log closed Sun Oct 21 00:00:33 2007 |