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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: kamiga on November 05, 2012, 04:07:55 AM

Title: Bug Katcher for Agnus
Post by: kamiga 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
Title: Re: Bug Katcher for Agnus
Post by: ChaosLord on November 05, 2012, 09:54:36 AM
I don't get it.  I just woke up.  What is it?
Title: Re: Bug Katcher for Agnus
Post by: alexh 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.
Title: Re: Bug Katcher for Agnus
Post by: ChaosLord 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.
Title: Re: Bug Katcher for Agnus
Post by: _ThEcRoW on November 05, 2012, 01:58:56 PM
Nice photo!. Keep up the hardware hacking!!!!
Title: Re: Bug Katcher for Agnus
Post by: alexh 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?
Title: Re: Bug Katcher for Agnus
Post by: Lurch 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 :-)
Title: Re: Bug Katcher for Agnus
Post by: freqmax 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.
Title: Re: Bug Katcher for Agnus
Post by: Zac67 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... ;)
Title: Re: Bug Katcher for Agnus
Post by: psxphill 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.
Title: Re: Bug Katcher for Agnus
Post by: freqmax on November 05, 2012, 10:06:56 PM
What's "m8" ..?
Title: Re: Bug Katcher for Agnus
Post by: paul1981 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!
Title: Re: Bug Katcher for Agnus
Post by: carvedeye on November 05, 2012, 10:26:44 PM
Quote from: freqmax;713973
What's "m8" ..?


You are joking right? mate :)
Title: Re: Bug Katcher for Agnus
Post by: CodePoet on November 05, 2012, 11:31:32 PM
We're contiguous up to M7 here, no M8 :(
Title: Re: Bug Katcher for Agnus
Post by: freqmax on November 05, 2012, 11:33:40 PM
Ahh, the English became aware there's a whole world outside that pesky island ;)