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"Mark Riley" <markril@hotmail.com> writes:
>
> 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 motor since
> accesses to these locations can use the processor's
> 8 bit addressing modes. And, because of the
> "shadowing" by the RAM, the various bit instructions
> seem to work fine. I bet the H8 designers left this
> little hole just so these instructions could be used
> on external devices.
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
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
I åa ä e ö å i öa ä e å.
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16 Messages in This Thread: ![Motor Control Register (0xf000) -Mark Riley (13-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/246.gif) ![Re: Motor Control Register (0xf000) -Joseph Woolley (13-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/246.gif) ![Re: Motor Control Register (0xf000) -Mark Riley (13-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/46.gif) ![Re: Motor Control Register (0xf000) -Joseph Woolley (14-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: Motor Control Register (0xf000) -Jochen Hoenicke (14-Nov-02 to lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Motor Control Register (0xf000) -Juergen Stuber (13-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Motor Control Register (0xf000) -Kekoa Proudfoot (13-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/246.gif) ![Re: Motor Control Register (0xf000) -Mark Riley (14-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/246.gif) ![You are here](/news/here.gif) ![](/news/46.gif) ![Re: Motor Control Register (0xf000) -Mark Riley (14-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: Motor Control Register (0xf000) -Kekoa Proudfoot (20-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: Motor Control Register (0xf000) -Juergen Stuber (14-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/46.gif) ![Re: Motor Control Register (0xf000) -Kekoa Proudfoot (20-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif) ![](/news/46.gif) ![Re: Motor Control Register (0xf000) -Juergen Stuber (21-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Motor Control Register (0xf000) -Ricardo Ferreira (27-Nov-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
![](/news/x.gif) ![](/news/68.gif) ![Re: Motor Control Register (0xf000) and Memory Space 0xFDB0-0xFD7F -Dick Swan (1-Dec-02 to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)](/news/x.gif)
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