| --- Log opened Wed Aug 26 00:00:52 2015 |
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| 01:02 | <~Vornicus> | Okay so I've broken it up into several parts; there are four trapezoids, using small-circle-center, large-circle-center, large-tangent-point, and small-tangent-point |
| 01:03 | <~Vornicus> | Those are size sqrt(2)*3/4; sqrt(2) is exactly the length of the tangent segment |
| 01:06 | <@Reiv> | that... makes sense, actually |
| 01:07 | <~Vornicus> | Okay, total is: 3sqrt(2) + 4atan(1/3) + atan(3) |
| 01:10 | <~Vornicus> | ...one moment |
| 01:12 | <~Vornicus> | Okay, I was in error |
| 01:12 | <~Vornicus> | 3sqrt(2) + 4atan(sqrt(1/8)) + atan(sqrt(8)) |
| 01:16 | <~Vornicus> | = 3sqrt(2) + 3atan(sqrt(1/8)) + pi/2 |
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| 01:48 | <~Vornicus> | or with fewer math calls and parentheses: = 3sqrt(2) + 3asin(1/3) + pi/2 ~= 6.83 |
| 01:49 | <~Vornicus> | (divide by pi to get ratio to central circle) |
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| 03:53 | <@Reiv> | blink blink |
| 03:53 | <@Reiv> | so 6.83/3.14 = 2.18, ish |
| 03:53 | <@Reiv> | So it's a little over double the size. |
| 03:54 | <@Reiv> | Well, that is indeed interesting. |
| 04:21 | <@Reiv> | Vornicus: So does the area change if you move the little circles? |
| 04:22 | <~Vornicus> | Yes. |
| 04:22 | <~Vornicus> | Well -- if you move the circles further or closer, yes |
| 04:23 | <~Vornicus> | If you move the circles *around* the big circle, it will start to change the area once the circles can see/shoot death rays at each other |
| 04:24 | <~Vornicus> | but not until then. |
| 04:25 | <~Vornicus> | changing the sizes of the circles of course also changes the area. |
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| 04:43 | <@Reiv> | Interestin'. |
| 04:43 | <@Reiv> | Well, I'm mildly dissapointed the answer wasn't funkier |
| 04:44 | <@Reiv> | But it seemed an interesting puzzle; thank you! |
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| 09:44 | <@froztbyte> | McMartin: http://forum.6502.org/viewtopic.php?f=4&t=3329 |
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| 10:58 | <@Alek> | McM: http://i.imgur.com/vXIZn75.png |
| 11:14 | <&McMartin> | Alek: I checked the stats and this is not true, though some games (particularly simple BASIC ones) can be ported easily |
| 11:14 | <&McMartin> | It's more a faster Spectrum 48, but with less memory. |
| 11:14 | <&McMartin> | Also a weaker display. |
| 11:16 | <@TheWatcher> | Now, a ti-89 might be a different matter... |
| 11:16 | <&McMartin> | The TI-83 literally is the Speccy chip, though. It's a Z80 overclocked to 6MHz. |
| 11:16 | | * TheWatcher nod |
| 11:18 | <@TheWatcher> | (the 89 is a 68k processor @10/12/16MHz depending on revision, with 190K usable RAM and 640K flash) |
| 11:19 | <@TheWatcher> | (still monochrome, 160x100 display, though) |
| 11:19 | <&McMartin> | That puts it at "Early Amiga or Mac with better speed and worse I/O) |
| 11:19 | <&McMartin> | s/)/"/ |
| 11:25 | | * McMartin looks at 68k code. "Yeah, that's pretty good." |
| 11:34 | <@TheWatcher> | The range of 68k addressing modes is made of wonderful and awesome and terrifying, and I missed the hell out of some of them when I was doing MIPS and then ARM as an undergrad. |
| 11:37 | <@gnolam> | Terrifying? |
| 11:37 | <@gnolam> | I just found them /nice/. |
| 11:41 | <&McMartin> | Oh, postincrement modes |
| 11:42 | <&McMartin> | The 8088's "rep stosw" is still the most batshit thing in the history of things. I blame the 16-bit era. |
| 11:42 | <&McMartin> | Er, sorry, rep movsw |
| 11:42 | <&McMartin> | That's "copy a word from [DS:SI] to [ES:DI], increment SI and DI by 2 each, and do this a number of times equal to the value of register CX" |
| 11:43 | <&McMartin> | rep stosw stores CX copies of AX to memory starting at ES:DI, naturally |
| 11:44 | <&McMartin> | One gets the impression Intel hadn't actually heard about addressing modes and just hardcoded address modes and register names directly into the opcode |
| 11:47 | <@froztbyte> | McMartin: alternative explanation: ASM leads to braindamage |
| 11:48 | <&McMartin> | The thing is, the "true 16-bit" systems - the 8086 and the 65816 - were spectacularly hideous in ways that neither the 32-bit (like the 68k) nor the 8-bit (like the 6502) chips were |
| 11:48 | <@TheWatcher> | froztbyte: The way I heard it described at one time was "It requires a certain sort of mind, and a willingness to lose it" |
| 11:48 | <@froztbyte> | :) |
| 11:48 | <&McMartin> | >.> |
| 11:50 | <@TheWatcher> | (I generally contend that should be s/It/Ruby/ but anyway~) |
| 12:02 | <@Alek> | McM, thanks, I was pretty sure the whole source where I got it was [citation needed] :P |
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| 12:04 | | * Alek liked his TI-89, btw. still has it, it may even run, after battery replacement. heck, the -86 may also, but it's got a vertical stripe of display gone. :( |
| 12:06 | <@TheWatcher> | I ended up sticking a TI-89 emulator my phone, save me having to carry my real one and the phone >.> |
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| 15:55 | <&ToxicFrog> | McMartin: those opcodes look basically like someone wanted hardware support for memset() and memcpy() and didn't much care if it was ugly. |
| 16:01 | <@celmin|sleep> | "rep stosw"? |
| 16:01 | <@celmin|sleep> | ^movsw |
| 16:01 | <@celmin|sleep> | Sorry, was scrolled up. |
| 16:03 | <@celmin|sleep> | ...yeah, come to think of it, they do sound like memset/memcpy. |
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| 16:27 | <&McMartin> | ToxicFrog: It would not surprise me if causality there were backwards, but yes |
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| --- Log closed Thu Aug 27 00:00:08 2015 |