 | | Re: Drive R/C Servos with the RCX and pbForth (long)
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(...) If you're using a custom motor driver in pbForth, why use the inverter circuit at all? Why not just generate the desired waveform directly? Is there not enough current to drive the servo that way? --Ben (26 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Drive R/C Servos with the RCX and pbForth (long)
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Hi again everyone! A few days ago I announced that I had developed a nice little circuit using easily available parts that would let you connect servos to the RCX - with no external batteries or microprocessors or anything! At that time, I said that (...) (26 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)
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| | Re: How much memory finally?
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Here's the latest update. Hope we will get a clear picture of this #@$@ memory after all. The point is that the RCX processor can address 64k of memory, so let's divide this range into 4 equal area of 16k. (note:16k or 16384, in hex is 0x4000). (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally? ADDENDUM
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I have seen some systems that have RAM set up this way: The first area is for the system, the second area is user programs and is allocated from the bottom up. The third area is user (and system) data, allocated from the top down. They "meet in the (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally? ADDENDUM
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Hey, that's a pretty nice idea! Any volunteer? D. (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally? ADDENDUM
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I haven't seen anyone talk about hacking a memory expansion (hardware) yet. Dennis (...) -- Dennis Williamson - Certified Y2K Complacent Bad News: The next millenium starts on a Monday. Good News: You get the day off. (remove .NO and SPAM. to reply) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: infrared communication
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(...) I dont know what the max distance for two RCXs is. But i have had the infared transmitter as far as 40 feet from the RCX, with no obstructions in the way and they still communicate. I would bet they have a pretty good range. Jeff (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | RE: How much memory finally? ADDENDUM
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(...) There is no user memory from 0x4000 to 0x8000 - It's all ROM space but it might not be used. I look at things in terms of replacement firmware, and the RCX is very flexible in this regard. The RAM for replacement firmware starts at 0x8000. (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | infrared communication
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What is the maximum distance for infrared communication between two RCXs (say with new batteries)? Do the RCXs have to 'face' each other? Thanks, Michael (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally? ADDENDUM
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Well, I checked with Kekoa's memory map, and indeed, thinks are not as simple. And Dave was right (Why did I doubt is sacred words?) Memory is divided into three main area of 16k. The first is ROM, containing the base programs. The two other (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally?
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Thank for the answer, Dave, this is the kind of info I'm looking for. BUT! I don't think it is correct: 0x8000 is 32k: the firmware would start at the end of memory!?! 0xbfff is 48k: unless the 16k of the rom are counted of course... Then this mean (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: Tactical Robot - A robot that play a board game REALLY!!!
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-- ___...___ Ferrara Francesco Jeffrey Baldwin <Heatwaaave@aol.com> wrote in message news:FpGE5u.B4w@lugnet.com... (...) know (...) TAR Know when it win, and make some sounds when it is in advantage... (relative to its score!) I have spent 2-3 (...) (26 years ago, 6-Feb-00, to lugnet.robotics, lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: How much memory finally?
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(...) I believe it has a 16K ROM and 32K SRAM. Within the 32K, 16K is occupied by the 'firmware' downloaded to the RCX. About 6K is reserved for bytecode program space and the datalog. Presumably the rest is working memory for the firmware (stack, (...) (26 years ago, 10-Feb-00, to lugnet.robotics.rcx)
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| | Re: How much memory finally?
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(...) If I remember correctly the RCX has a 16kROM for the basic routines. It has 32k RAM for firmware and programs. The scout has 32K ROM and only 1K RAM (400bytes for your program) Dean (26 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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| | Re: rcx 1.0 and an ac adaptor
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(...) The 'official' adapter, is 10VAC, 0.7A. I have seen one person who blew the rectification bridge, and he simply replaced this himself ((it was an old unit). There are two 'possibly combined' problems. DC, puts all the load on just one pair of (...) (26 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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| | How much memory finally?
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I'm trying to figure out how much memory the RCX has. Many sources claims that it has - 16k rom - 16k ram for the firmware - 6k reserved for our own programs Does this mean the RCX has 22k of RAM memory? What an odd number... Also, when I perform (...) (26 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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| | Re: rcx 1.0 and an ac adaptor
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(...) (26 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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| | Re: Radio Shack CDS cells in parallel
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(...) ----- True, but the RS CDS cells are cheap and using them in parallel or series also changes the response range, since all the resistances change with light levels. This would be most dramatic in the series connected case at the low resistance (...) (26 years ago, 9-Feb-00, to lugnet.robotics.rcx)
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| | Re: Radio Shack CDS cells in parallel
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(...) I built a sensor out of one of those and it works fine, so yours is probably defective. I superglued mine to the top of a 2x2 brick with the studs removed. You can see my high tech design at (URL)I tried this idea and it worked. You can put (...) (26 years ago, 8-Feb-00, to lugnet.robotics.rcx)
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| | Re: rcx 1.0 and an ac adaptor
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(...) According to Knudsen's book, AC or DC in either polarity is fine (which is great!). That's the only place I've seen the input characteristics mentioned, is there an "official" spec anywhere? One thing you might want to be careful of: I read (...) (26 years ago, 8-Feb-00, to lugnet.robotics.rcx)
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