Subject:
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Re: RCX sound circuit
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 27 Jun 2005 13:45:31 GMT
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Viewed:
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1098 times
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Hi,
I haven't really got the first clue what you are talking about here, but I would
like to - any suggestions for reading up on this stuff?
Thomas
In lugnet.robotics, Philippe Hurbain wrote:
> Hello Mark,
>
> > Your circuit diagram checks out Philo, though a 47k resistor to ground should be
> > added to the processor connection.
>
> Quite possible as I obtained the schematics only with an ohmeter...
>
> >
> > I was wondering what the other NAND gate is used for. Input pin 1 traces to
> > somewhere under the ROM. Input pins 2 and 13 and output pin 12 disappear
> > elsewhere.
>
> I spent some time again with my ohmeter, here is the schematics for this part:
> http://www.brickshelf.com/gallery/Philo/RCX-comp/motor_cmd.gif
>
> This is the motor driver control circuitry, data is latched when there is a
> write to address x111 xxxx xxxx xxxx (binary). As I think H8 is used in mode 2,
> A15 is always 1 for external access, so any write to fxxx should write to motor
> driver latches. In the schematics, OUT_X_1 and OUT_X_2 are connected to Melexis
> motor drivers in1 and in2.
>
> > I suggest that a 3-input NAND gate was needed by the main computer circuit and
> > that the speaker driver circuit just mopped up the spare gates.
> Probably, yes ;o)
>
> Philo
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Message is in Reply To:
 | | Re: RCX sound circuit
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| Hello Mark, (...) Quite possible as I obtained the schematics only with an ohmeter... (...) I spent some time again with my ohmeter, here is the schematics for this part: (URL) is the motor driver control circuitry, data is latched when there is a (...) (19 years ago, 27-Jun-05, to lugnet.robotics)
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