Re: I,Robot Mathbox Question...

If anyone has an interest in disassembling the code provided above, a
reference to the CPU mnemonics may be found here...

http://www.lomont.org/Software/Misc/CoCo/Lomont_6809.pdf

On Tue, Feb 18, 2014 at 9:06 PM, Matthew Rossiter <matt@rossiters.com>wrote:

> I'll sometimes take the risk of looking stupid just for the sake of
> clarification. :). I figured it might also jog a response from others.
>
> Sent from my iPhone
>
> On Feb 18, 2014, at 4:28 PM, Jess Askey <jess@askey.org> wrote:
>
> Binary sequence: That listing of 2-byte words that was in the original
> email... this one...
>
>
>
> 9000
>
> 8000
>
> 0B40
>
> 00E0
>
> 0000
>
> FF00
>
> 00EE
>
> 0590
>
> 3FC2
>
>
>
>
>
> Now, granted, I think there may be a JSR in there to a more complex
> location (I think there might be, however there may not be)... either way,
> that little snippet of binary there, should basically YAW rotate 5 degrees
> some sort of matrix and just a hunch, that matrix may exist at offset 0B40
> (in MBOX RAM @ 2B40 then) and perhaps it may be writing the result to MBOX
> RAM at offset 0590?
>
>
>
> Im just trying to figure out how this set of instructions translates into
> a YAW 5 degrees.
>
>
>
> My end game is just like yours... I have a PCB set with infinite 'Black
> Hole' messages and all ROM's, RAM's, PROM', BitSlicers test good (PROM
> sockets seem fine too).... But the Mathbox passes self test just fine.
>
>
>
> I emailed John M*nfreda for some CPU disassembly advice and haven't heard
> back but not everyone has time to dig into this stuff so deep, so I
> understand. It probably isn't all the easy to answer the question I posed
> of 'what causes the Black Hole message'... exactly that is. ;-)
>
>
>
> jess
>
>
>
> *From:* owner-vectorlist@vectorlist.org [
> mailto:owner-vectorlist@vectorlist.org <owner-vectorlist@vectorlist.org>] *On
> Behalf Of *Matthew Rossiter
> *Sent:* Tuesday, February 18, 2014 3:14 PM
> *To:* vectorlist@vectorlist.org
> *Subject:* Re: VECTOR: 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 set DISASSEMBLE_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
>
>
>
>
>
>

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Received on Tue Feb 18 22:41:33 2014