Re: ROM Dump of Amiga Keyboard controller

From: Gerrit Heitsch <>
Date: Tue, 26 Aug 2014 18:15:04 +0200
Message-ID: <>
On 08/26/2014 06:07 PM, wrote:
> On 2014-08-25 at 08:35:22, Gerrit Heitsch ( wrote:
>>>> wrote:
>>>>> Also, this still doesn't explain why the 6570-036 works in my Amiga
>>>>> keyboard while the 6571-036 doesn't, and the ROM dump results in
>>>>> identical files. Did someone look at the dump to see if it looks like
>>>>> code for a keyboard controller? It does a checksum test at power up.
>>>> I know it's a long shot, but maybe your 6571-036 is kind of broken in
>>>> a way, which still allows enough functionality to do what Jim did to it?
>>> Remember what Jim said happenned when he tried to use the dumper-in-RAM
>>> method:
>>>> 6570 would generate a bunch of 0xff, but the 6571 gave me nothing.
>>> Maybe, the 6571's RAM has failed.
>> There is a blink code for failed RAM though.
> True. Yet we can imagine situations where this wouldn't work, can't we? As I mentioned on the beginning - it's a long shot but as long as the pinout and the ROM code are the same - what else? Maybe some I/O port bits (which Jim didn't use)?

Somewhere in my collection I have another 6571-036 (same paper sticker), 
when I find it, I'll try it in the keyboard.


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Received on 2014-08-26 17:00:38

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