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Author Topic: Bug Katcher for Agnus  (Read 3194 times)

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Offline kamigaTopic starter

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Bug Katcher for Agnus
« on: November 05, 2012, 04:07:55 AM »
I thought the people here might be the only ones around to appreciate this image, so I thought I might post this here.

This is a recently installed Bug Katcher on an A500 motherboard.

I was excited to show someone who might understand the fun I could have with this!

http://techtravels.org/amiga/bug_katcher_installed.jpg
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Offline ChaosLord

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Re: Bug Katcher for Agnus
« Reply #1 on: November 05, 2012, 09:54:36 AM »
I don't get it.  I just woke up.  What is it?
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Offline alexh

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Re: Bug Katcher for Agnus
« Reply #2 on: November 05, 2012, 09:58:26 AM »
It is an "off the shelf" logic analyser adapter.

With it he will be able to easily connect all the Agnus pins to a logic analyser and capture bus waveforms.

It's only real use is reverse engineering the Agnus chip.
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Offline ChaosLord

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Re: Bug Katcher for Agnus
« Reply #3 on: November 05, 2012, 10:52:27 AM »
Please make us a 100% compatible FPGA Agnus.  Then bump up the chipram to 256MB or somesuch.  Thanx.
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Wanna try a wonderfull strategy game with lots of handdrawn anims,
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English speech, etc. Total Chaos AGA
 

Offline _ThEcRoW

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Re: Bug Katcher for Agnus
« Reply #4 on: November 05, 2012, 01:58:56 PM »
Nice photo!. Keep up the hardware hacking!!!!
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Offline alexh

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Re: Bug Katcher for Agnus
« Reply #5 on: November 05, 2012, 02:54:20 PM »
Quote from: ChaosLord;713941
Please make us a 100% compatible FPGA Agnus.

What's wrong with the existing one?
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Offline Lurch

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Re: Bug Katcher for Agnus
« Reply #6 on: November 05, 2012, 05:56:52 PM »
Quote from: alexh;713956
What's wrong with the existing one?


Thinking he wants more than 2MB chip RAM :-)
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Offline freqmax

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Re: Bug Katcher for Agnus
« Reply #7 on: November 05, 2012, 05:57:02 PM »
@alexh, Bugs? ;)

I think this is the right way to figure the chip out. Feed the real Agnus input to an FPGA Agnus core and compare output then one will get a signal when there's a difference.

The hard part is how to use the generated debug data. Signal integrity, ground plane, EMI, jitter etc are some basic "oops" in these kind of projects.
« Last Edit: November 05, 2012, 06:13:06 PM by freqmax »
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Offline Zac67

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Re: Bug Katcher for Agnus
« Reply #8 on: November 05, 2012, 06:45:37 PM »
Quote from: freqmax;713961
I think this is the right way to figure the chip out. Feed the real Agnus input to an FPGA Agnus core and compare output then one will get a signal when there's a difference.


Don't think that'll work m8... ;)
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Offline psxphill

Re: Bug Katcher for Agnus
« Reply #9 on: November 05, 2012, 09:23:30 PM »
Quote from: Zac67;713964
Don't think that'll work m8... ;)

That is quite a common way of testing things actually.
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Offline freqmax

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Re: Bug Katcher for Agnus
« Reply #10 on: November 05, 2012, 10:06:56 PM »
What's "m8" ..?
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Offline paul1981

Re: Bug Katcher for Agnus
« Reply #11 on: November 05, 2012, 10:23:30 PM »
Quote from: freqmax;713973
What's "m8" ..?

It's a motorway in Scotland. Didn't you know that? JC!
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Offline carvedeye

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Re: Bug Katcher for Agnus
« Reply #12 on: November 05, 2012, 10:26:44 PM »
Quote from: freqmax;713973
What's "m8" ..?


You are joking right? mate :)
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Offline CodePoet

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Re: Bug Katcher for Agnus
« Reply #13 on: November 05, 2012, 11:31:32 PM »
We're contiguous up to M7 here, no M8 :(
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Offline freqmax

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Re: Bug Katcher for Agnus
« Reply #14 on: November 05, 2012, 11:33:40 PM »
Ahh, the English became aware there's a whole world outside that pesky island ;)
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