| --- Log opened Wed Jun 20 00:00:28 2007 |
| 00:16 | | ToxicFrog|W`rkn is now known as ToxicFrog |
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| 01:18 | < MyCatVerbs> | ToxicFrog: out of curiosity, where's the demon fixation line from, please? Princess Bride? |
| 01:24 | <@ToxicFrog> | Penny Arcade, IIRC. |
| 01:29 | <@ToxicFrog> | http://www.penny-arcade.com/comic/2003/08/29 |
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| --- Log closed Wed Jun 20 10:13:52 2007 |
| --- Log opened Wed Jun 20 10:13:55 2007 |
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| 15:26 | | * AnnoDomini is trying to learn up for tomorrow's Microprocessor Technology exam. Are any of you people acquainted with programming a Motorola M6800 processor, and could you show me what a program for this looks like? |
| 15:26 | <@ToxicFrog> | 68000, surely. |
| 15:26 | <@ToxicFrog> | And yes, I am. |
| 15:27 | <@ToxicFrog> | Although it's been a while. |
| 15:27 | <@ToxicFrog> | (and I don't have the manual with me) |
| 15:28 | < AnnoDomini> | No, the lecture notes say M6800. |
| 15:29 | | * ToxicFrog consults the intarwebs |
| 15:30 | <@ToxicFrog> | Aah. In that case, no, I can't help you. I've only worked with the 68k. |
| 15:31 | < AnnoDomini> | Hrm. Maybe it can help me, nonetheless. We're supposed to (I think) write short assembly programs. Like one than multiplies a number by 4. |
| 15:31 | < AnnoDomini> | I'm pretty sure it can be done with a shift, but... I don't know where to start, even with the command list. |
| 15:33 | | * AnnoDomini has never coded in assembly. |
| 15:36 | <@ToxicFrog> | ...er. Why are they testing you on that on the exam, then? |
| 15:36 | <@ToxicFrog> | And yeah, a left shift of 2 will do tat. |
| 15:38 | < AnnoDomini> | Because we had lectures with a guy who refuses to use the microphone despite having a weak voice, who worked on malfunctioning software and presented us with an abstract overview of incomprehensible material on the M6800 and its use. |
| 15:38 | < AnnoDomini> | Attendance was minimal (<20%), too, and the hour mostly prevented any conscious effort. |
| 15:39 | | * AnnoDomini sighs. |
| 15:40 | <@ToxicFrog> | ... |
| 15:40 | <@ToxicFrog> | Joy. |
| 15:41 | < AnnoDomini> | Yesindeed. |
| 15:41 | <@Vornicus> | I thought the 68000 had a built in mul. |
| 15:41 | < AnnoDomini> | This is 6800. Six-eight-zero-zero. |
| 15:43 | <@Vornicus> | ah |
| 15:43 | < AnnoDomini> | The exam will be composed of three tasks - two theoretical, and one practical (the assembly programming). If all goes well, I can memorize enough of the material to pass those. |
| 15:43 | <@Vornicus> | HCF! |
| 15:43 | < AnnoDomini> | I mean, the theory. |
| 15:44 | < AnnoDomini> | HCF? |
| 15:44 | <@Vornicus> | Halt and Catch Fire! |
| 15:44 | <@ToxicFrog> | The 6800 had an HCF - Halt & Catch Fire - instruction. |
| 15:45 | <@Vornicus> | "The Motorola 6800 microprocessor was the first for which an HCF opcode became widely known. The instruction makes the processor enter a mode intended for manufacturing testing, in which it continuously performs memory read cycles from successive addresses, with no intervening instruction fetches. Effectively the address bus becomes a counter, allowing the operation of all address lines to be quickly verified. Once the processor has entered this test mode |
| 15:45 | <@Vornicus> | it is not responsive to interrupts, so normal operation can only be restored by a reset." |
| 15:45 | <@ToxicFrog> | What it actually did was drop the processor into a memory test mode. |
| 15:45 | <@ToxicFrog> | (and I know it as HMCF - Halt, Melt & Catch Fire) |
| 15:45 | <@Vornicus> | "There are apocryphal results of damage resulting from the use of such instructions, but there is no documented evidence of such an instruction actually causing damage to a computer. Obviously special instructions designed into a processor for use in manufacturing tests would not be designed in such a manner as to cause damage to that processor." |
| 15:57 | < AnnoDomini> | When writing assembly, does one use base 10 or base 16? |
| 15:57 | < AnnoDomini> | I mean, for input values or whatnot. |
| 15:57 | | ToxicFrog is now known as ToxicFrog|W`rkn |
| 15:58 | <@Vornicus> | Often you can do either, you should look at your reference manual though. |
| 15:58 | <@ToxicFrog|W`rkn> | ...generally, you can use either. |
| 15:58 | <@ToxicFrog|W`rkn> | It all gets translated into machine code, after all. |
| 15:58 | <@Vornicus> | To see how to make such stuff. |
| 15:59 | <@ToxicFrog|W`rkn> | It's common to use $123 for hex, and e for binary, but check your assembler documentation for the convention it uses. |
| 15:59 | <@ToxicFrog|W`rkn> | ...er. |
| 15:59 | <@ToxicFrog|W`rkn> | %101 for binary. |
| 15:59 | < AnnoDomini> | I see. |
| 16:20 | <@gnolam> | MOVE.L AnnoDomini,(A0)+ |
| 16:21 | | AnnoDomini is now known as nnoDomini0 |
| 16:48 | <@ToxicFrog|W`rkn> | Interesting. |
| 16:48 | <@ToxicFrog|W`rkn> | The systems we build with GCC are noticeably faster than the ones we build with MSDEV, but use more memory. |
| 17:06 | | You're now known as TheWatcher[afk] |
| 17:25 | <@ToxicFrog|W`rkn> | ...hmm. |
| 17:25 | <@ToxicFrog|W`rkn> | At some point, I decided that the object table and the object metatable should be seperate. |
| 17:25 | <@ToxicFrog|W`rkn> | I no longer remember why I did this. It seems like a bad idea. |
| 17:34 | <@Vornicus> | what do the object table and the object metatable do? |
| 17:39 | <@ToxicFrog|W`rkn> | The object table holds all of the object's fields. |
| 17:39 | <@ToxicFrog|W`rkn> | The object metatable holds operator overloads. |
| 17:40 | <@Vornicus> | aha. |
| 17:42 | <@ToxicFrog|W`rkn> | In particular, you have a proxy object (a one-byte userdata); the metatable is applied to the proxy to implement operator overloads, and refers __index and __newindex operations (by default) to the object table. |
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| --- Log closed Thu Jun 21 00:00:34 2007 |