Re: I,Robot Mathbox Question...

Well, I'd like to give this thread a "bump" because I too would like to
understand how to diagnose an I'Robot mathbox issue. I get the "black
hole" error message. While I know the general area of circuitry where
the fault is, I get lost in all the loops. Unfortunately I'm not
code-savy enough to provide a good answer to your question. I do have
a dumb question though, which binary sequence are you referring to?

Matt

Are you basically

On 2/8/2014 9:54 PM, Jess Askey wrote:
>
> Im sending this to vectorlist since rasterlist doesn't have any
> Mathboxes except I,Robot and Im not sure who subscribes where. I know
> everyone that might know the answer to this is here tho. Apologies....
>
> Im attempting to understand the I,Robot mathbox instructions using the MAME Source and the Memory Window of MAME so I can fix an I,Robot PCB with a bad mathbox issue. Im in the process of getting MAME compiling so I can setDISASSEMBLE_MB_ROM = 1 to examine more.
>
> The MAME source is here...
> http://mamedev.org/source/src/mame/machine/irobot.c.html
>
> Upon boot, the CPU does some basic tests (thank you Frito) of Pitch,
> Roll and Yaw rotations of 5 degrees and checks the result. If the
> number matches the predetermined value stored in ROM, then the test
> passes. If not, the Self Test shows the various 'Y Bad Data' or 'X Bad
> Data' etc.
>
> The CPU puts this code into the Mathbox RAM for the YAW_5_DEGREES test
> (the first test)
>
> 9000
>
> 8000
>
> 0B40
>
> 00E0
>
> 0000
>
> FF00
>
> 00EE
>
> 0590
>
> 3FC2
>
> I have been trying to map instruction set to the Mathbox instructions
> in the MAME source above, which only consists of ADD, SUBTRACTS, OR,
> AND, XOR and some inverted variants.
>
> Caveat: I got a C in Linear Algebra, so Im not that smart. J
>
> Since the mathbox is doing rotations/translations and from what I read
> in Jed's nice write-ups like this one
> (http://www.jmargolin.com/uvmath/uvmath.htm)
>
> There needs to be some multiplication/division... I see the shifts in
> the DESTX Defines, which Im guessing covers that?
>
> Can anyone help me understand how the MAME source commands relate to
> this binary sequence?
>
> Thank you! Jess
>

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Tue Feb 18 17:14:12 2014