Re: ROM Dump of Amiga Keyboard controller

From: Gerrit Heitsch <>
Date: Sun, 24 Aug 2014 19:02:52 +0200
Message-ID: <>
On 08/20/2014 04:56 PM, Martin Hoffmann-Vetter wrote:

>> If a 6571R6PD (with part number 315107-01) is labeled with a sticker as
>> 6571-036 with the part number 328191-02, so it must be interchangeable. If
>> the 6570 is mask programmable, does the 6571 real programmable after
>> production? Is the part number 315107-01 for an empty 6571?

No, it could just mean that the people who packaged the Chip printed the 
wrong label on it. Remember, MOS made the dies and only packaged a small 
number of them, the rest was shipped to different manufacturers around 
the world and packaged and labeled there. To find out where a certain 
MOS IC was packaged, look on the underside.

I have seen a photo showing a C64 board where the VIC had such a paper 
label on it. Unfortunatly, never found out what was written under it.

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.


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Received on 2014-08-24 18:00:03

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