Re: ROM Dump of Amiga Keyboard controller

From: Gerrit Heitsch <>
Date: Wed, 11 Jun 2014 18:01:23 +0200
Message-ID: <>
On 06/11/2014 05:29 PM, Rainer Buchty wrote:
> On Wed, 11 Jun 2014, Gerrit Heitsch wrote:
>> External test equipment can use this feature to test internal CPU
>> logic and I/O. A program can be loaded into RAM allowing the contents
>> of the instruction ROM to be dumped to any port for external
>> verification.
> To me that -- optimistically -- confirms the "ROM-only" theory, although
> admittedly the wording is very vague.

No matter how, you will still have to return RESET to +5V before you can 
read and dump the ROM. :)

> I'm already suprised to see the "apply 10V to reset" hint there.
> Usually, such information is not publicly disclosed.

That depends on the target audience for the datasheet of course.

>> To really know what's going on one would need a die shot.
> Or be brave :) Not sure, how much /1 supply there's left, though.

I don't have a spare keyboard controller though...

> As time allows, I'll try my luck with the 6500/11 I have ... In that
> very case I might even be able to see the external memory strobe come to
> life (which the /1 doesn't have).

Do you have a datasheet for that one somewhere?


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Received on 2014-06-11 16:02:17

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