 | | Re: Motor Control Register (0xf000)
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(...) In that case, why didn't the RCX designers use an 8 input NAND to decode their addresses, to leave more of the RAM usable? Maybe there werent aware of this possibility? Jürgen (22 years ago, 14-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Motor Control Register (0xf000)
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It also turns out that there are 8 bytes of external RAM that peek through at addresses 0xff80-0xff87. Writes to these locations also affect the motor control register. I suppose there's a small advantage in using these registers to control the (...) (22 years ago, 14-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Motor Control Register (0xf000)
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(...) This is interesting. It makes sense that the memory backing these locations still works, but I never would have thought to try to use it. I will make a note of this on my pages. -Kekoa (22 years ago, 13-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Motor Control Register (0xf000)
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(...) Interesting, I never looked at that version. I think the one disassembled by Kekoa is 0309. Current versions of leJOS also use this upper memory to store part of its firmware (almost 3K). Jürgen (22 years ago, 13-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Motor Control Register (0xf000)
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Joe, [some reordering of comments for clarity] (...) The idea is to pick a certain number of functions that will fit in the upper RAM space (~2900 bytes) and put these functions in a seperate linker section (other than the default ".text" section). (...) (22 years ago, 13-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Motor Control Register (0xf000)
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Mark, This is very interesting. I have experienced strange motor behavior with programs on BrickOS before; I now wonder if this may have been the situation. I do not currently know enough about GCC to make the changes that you mentioned, but I am (...) (22 years ago, 13-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Motor Control Register (0xf000)
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Seeing as how there's been little traffic here recently, I thought I'd post about something I found that's cleared up a little mystery (for me at least). It concerns the RCX register that is used to control the motors. This register lives at 0xf000. (...) (22 years ago, 13-Nov-02, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | 'Cyber Sorter' a live (was B.Sc in LEGO)
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Hi everybody, A few monthes ago I announced that I'm making my final project for my B.Sc in electronics from LEGO mindstorms bricks. First of all I'd to say thanks for those who offered help and a name for my robot. The chosen name was 'Cyber (...) (22 years ago, 9-Nov-02, to lugnet.robotics, lugnet.robotics.rcx)
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| | Re: RIS 1.0 -> 1.5 -> 2.0 upgrade questions
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all it supplies is the new software, no USB tower....otherwise I would have gotten one long ago..... Timothy (...) (22 years ago, 6-Nov-02, to lugnet.robotics.rcx)
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| | Re: RIS 1.0 -> 1.5 -> 2.0 upgrade questions
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(...) Does the upgrade kit come with the USB tower, or just a CD-ROM? (...) Will the new RIS software support the IR tower or only a USB one? (22 years ago, 5-Nov-02, to lugnet.robotics.rcx)
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