| --- Log opened Sun Oct 14 00:00:45 2007 |
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| 00:37 | | * McMartin eyes this ad |
| 00:37 | <@McMartin> | "C# SQL and Ajax Skillz Needed" |
| 00:37 | <@McMartin> | I'm not convinced that it's possible to actually have skillz with those. |
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| 03:08 | <@ToxicFrog> | http://bash.org/?696919 |
| 03:09 | <@ToxicFrog> | bash.org/?696919 |
| 03:09 | <@ToxicFrog> | It's so true. |
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| 14:55 | <@AnnoDomini> | I have a problem. I have two sets of two 8bit cells. Each two cells represent a 16bit address in memory. Using two 8bit accumulators for calculations, I must determine determine the area of memory between them - first address is the start, second address is the end. I must know what length the space between them is. How do I do this? |
| 14:57 | <@AnnoDomini> | (If you need to know, this is programming of a Motorola 6800 processor.) |
| 14:59 | <@ToxicFrog> | 6800, not 68000? |
| 14:59 | <@AnnoDomini> | Correct. |
| 15:00 | <@ToxicFrog> | Well, the short, flippant answer is "subtract the higher from the lower", but I have no idea how you do that in that processor. |
| 15:00 | <@ToxicFrog> | How many bits of register does the 6800 give you? |
| 15:00 | <@ToxicFrog> | Oh, right. Two 8-bit accumulators. |
| 15:01 | <@AnnoDomini> | Yes. That's my problem. I'm having difficulty establishing how to subtract these. |
| 15:01 | <@AnnoDomini> | Since they're twice as bloody large as the containers I have. |
| 15:01 | <@ToxicFrog> | Compare the high bytes to see which is higher. Subtract the lower from the higher. Then subtract the corresponding low bytes. |
| 15:01 | <@ToxicFrog> | If the high bytes are identical, the difference in the resulting high byte is 0, so compare and subtract the low bytes only. |
| 15:02 | <@ToxicFrog> | ...oh, and there needs to be some additional logic to handle carry when subtracting the low bytes. |
| 15:02 | <@ToxicFrog> | Or possibly overflow, I forget which CCR gets set. |
| 15:02 | <@AnnoDomini> | You've grasped what my problem is, then. |
| 15:03 | <@ToxicFrog> | And solved it, I think. |
| 15:05 | <@AnnoDomini> | But what I need is that logic concerning the low bytes. As I've stated, this is what I have difficulty with. |
| 15:07 | <@gnolam> | If carry is set, subtract 1 from the higher byte? |
| 15:08 | <@AnnoDomini> | ((Also, I don't need to determine which is higher. If the start address is after the end address, then the program should return an error.)) |
| 15:08 | <@ToxicFrog> | You didn't actually say that, and yes, what gnolam said. |
| 15:09 | <@AnnoDomini> | "<AnnoDomini> Yes. That's my problem. I'm having difficulty establishing how to subtract these." <- I did. It's trivial to subtract the parts, but not just that simple for the whole. |
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| 15:33 | <@AnnoDomini> | Only the damn thing doesn't appear to have a carry lfga. |
| 15:33 | <@AnnoDomini> | *flag |
| 15:37 | <@ToxicFrog> | ... |
| 15:37 | <@ToxicFrog> | What does it have? |
| 15:37 | <@AnnoDomini> | A negative flag. The others I'm not sure what they do. |
| 15:39 | <@ToxicFrog> | Well, what are they called?' |
| 15:39 | <@ToxicFrog> | And don't you have a reference manual? |
| 15:39 | <@AnnoDomini> | H N Z V I. |
| 15:39 | <@ToxicFrog> | Z is the zero-flag, V is the overflow-flag, I is the interrupt mask bit. |
| 15:40 | <@AnnoDomini> | What's H? |
| 15:40 | <@ToxicFrog> | No idea. The 68000 and the 68HC12 don't have one of those. |
| 15:40 | <@AnnoDomini> | Sort of, but I'll be damned if I was taught to understand what it says. |
| 15:41 | <@ToxicFrog> | ? |
| 15:41 | <@ToxicFrog> | Aah. Refman. |
| 15:41 | <@AnnoDomini> | It seems to indicate that there is a carry flag, but one that isn't shown in the simulatore we use. |
| 15:42 | <@AnnoDomini> | H is supposed to be Half Carry. What's that mean? |
| 15:42 | <@ToxicFrog> | Don't recall. |
| 15:43 | <@ToxicFrog> | Anyways. What you really should be doing isn't checking the condition bits themselves, but the contract for SUB and friends, so that you know how it affects those bits. |
| 15:43 | <@ToxicFrog> | Then you'll know which one you need to check. |
| 15:46 | | * AnnoDomini 's head explodes. It's madness. Total madness. They didn't teach us anything of this complexity, yet they demand that we know it. |
| 15:47 | <@AnnoDomini> | Enough of this for one day. |
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| 15:48 | | * ToxicFrog goes back to working on a hex keypad driver with software debounce in MC68HC12 ASM |
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| 15:55 | < Vornicus> | debounce? |
| 15:57 | <@ToxicFrog> | When you close a switch - or button - the contacts actually hit each other and bounce away a few times. |
| 15:57 | <@ToxicFrog> | So for a few milliseconds, you have a very fast sequence of high-low-high-low-high-low signals. |
| 15:58 | <@ToxicFrog> | Debouncing is the process of filtering out these spurious keypresses. |
| 16:16 | <@gnolam> | Software debouncing? Ick. |
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| 22:48 | | * ToxicFrog grabs Haskell's type-inference mechanism and shakes it until a function reference falls out |
| 22:50 | <@ToxicFrog> | Theeeere we go. |
| 22:54 | <@AnnoDomini> | gnolam: You there? |
| 22:55 | <@AnnoDomini> | I need more advice on VHDL. |
| 22:56 | <@AnnoDomini> | http://pastie.caboo.se/107141 <- It tells me that in1, in2 and out1 are not declared. |
| 22:57 | <@AnnoDomini> | WHY THE FUCK is it saying that? They're right THERE, in the component declarations! |
| 23:02 | <@ToxicFrog> | What happens if you (1) make the case consistent between declaration and instantiation and (2) drop |
| 23:02 | <@ToxicFrog> | 'entity' from the port map directives? |
| 23:04 | <@AnnoDomini> | Where is case inconsistent? |
| 23:04 | <@AnnoDomini> | I'll check. |
| 23:05 | <@AnnoDomini> | It compiles. |
| 23:05 | | * AnnoDomini !!@#$%^&s. |
| 23:05 | | * AnnoDomini adds the maker of that tutorial the teacher linked to to the list of people first against the wall. |
| 23:06 | <@ToxicFrog> | VHDL is, I think, meant to be case insensitive. |
| 23:06 | <@ToxicFrog> | However, not all compilers of it are. |
| 23:06 | <@ToxicFrog> | Or possibly it's the other way around. |
| 23:07 | <@ToxicFrog> | What was the problem, in the end? The case, or the entity keyword? |
| 23:07 | <@AnnoDomini> | Why in the world would the teacher link to a tutorial that gives syntax incompatible with the compiler? |
| 23:07 | <@AnnoDomini> | Entity. |
| 23:08 | <@AnnoDomini> | Thanks muchly, ToxicFrog! |
| 23:11 | <@ToxicFrog> | Oh god no |
| 23:11 | <@ToxicFrog> | Random number generation means monads |
| 23:11 | <@AnnoDomini> | Monads? |
| 23:17 | <@ToxicFrog> | Don't ask me, I still don't grok then. |
| 23:17 | <@ToxicFrog> | *them. |
| 23:18 | <@ToxicFrog> | They're both a confusing mathematical construct, and a way of doing IO and other stateful operations in pure functional languages without unraveling reality like a cheap shirt. |
| 23:31 | < Mischief]> | Or a shirt made of cheap beer. |
| --- Log closed Mon Oct 15 00:00:52 2007 |