Subject:
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Re: Dissecting the RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 15 Feb 2002 22:00:45 GMT
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Original-From:
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Andy Gombos <gombos_2000@yahooNOSPAM.com>
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Viewed:
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631 times
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----- Original Message -----
From: "Rob Limbaugh" <rlimbaugh@ureach.com>
To: <lego-robotics@crynwr.com>
Sent: Friday, February 15, 2002 1:14 PM
Subject: Dissecting the RCX
> After looking up some component data sheets, I've found myself wondering a • few
> things:
>
> 1) The H8/3292 pin 42 connects to the D43256B pin 23. According to data
> sheets, this is A6 from the H8 and A11 on the RAM. Both data sheets show
> address numbering to be A0-A14. Does the RCX access the memory • non-linearily,
> or do I have data sheets for a different version of the D43256 series of • RAM
> chips? (I haven't checked the control pins yet to see if those match up • as
> expected according to the diagrams.)
>
> 2) Hitachi's H8 data sheets say there are 8 ADCs, but only 4 can be • monitored
> in the background continuously. Off the top of my head, I am assuming • voltage
> monitoring and the 3 input ports consume 4 of the 8... are the other 4
used?
IIRC, the other ADCs are used for the 4 buttons - therefore nothing else can
be detected.
>
> 3) Are there any unused I/O lines in ports 4 or 6 that might possibly be
> usable for bank-switching memory to increase RAM beyond 32K?
Also, IIRC no. A thread a while ago noted that the only open lines (if any)
were things that were unsuable for anything, like an extra clock or
something.
Andy
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Message is in Reply To:
 | | Dissecting the RCX
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| After looking up some component data sheets, I've found myself wondering a few things: 1) The H8/3292 pin 42 connects to the D43256B pin 23. According to data sheets, this is A6 from the H8 and A11 on the RAM. Both data sheets show address numbering (...) (23 years ago, 15-Feb-02, to lugnet.robotics)
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