Re: 6532, 6530-001, 6530-002...

From: Segher Boessenkool <>
Date: Sun, 5 May 2013 16:34:20 +0200
Message-Id: <>
> Dos it meant that when they were made, the component could be ordered
> With CS1/CS2 in place of PB5/PB6  ?

Yes.  When you ordered a 6530 you specified what connection you
wanted for the chip selects: for the ROM, it's an AND of any
combination of the three chip select signals or their complements;
for the RAM and the I/O each, it is an AND of any combination of
the three chip selects and A6..A9, or their complements.

If you do not use CS1/CS2 for addressing, you can use PB5/PB6 as
normal port pins; similarly for IRQ vs. PB7.

> Are the 6530-xxx all pin compatible, or is there multiple versions  
> according to the –xxx ?

The -xxx specifies the ROM contents, and the other mask options
too I suppose.  They are pin-compatible, with the caveat that
some use the high PB pins for chip select, and some do not.
There is also an option of removing the pull-up on PB7; there
might be more.


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Received on 2013-05-05 15:00:03

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