Re: FPGA (was: 6809 / 6702 puzzle)

From: Gerrit Heitsch <>
Date: Tue, 24 Apr 2012 19:02:26 +0200
Message-ID: <>
On 04/24/2012 05:34 PM, wrote:
> Hi Guys,
> A few things that came to mind:
> 1.
> The simplest solution would (as has already been said) to utilise some
> 'real' INTEL chips (e.g. 8088, 8259A etc.) and to put the majority of
> the 74LS devices into a 5V-tolerant CPLD. I would then use a separate
> CPLD to host the 6525/6526 combo (as these chips appear to be
> intertwined with each other and it would appear to be silly to implement
> the two separate chips in two CPLDs).

On the other hand, the 6526 is also used in the C64 and C128 and the 
6525 can be found in the 1551 and CBM-II series. So it might not be a 
bad idea to design them as seperate cores so they can be used for 
replacing dead chips in the other systems. Especially nice would be a 
28pin version of the 6525 since that one is used in the 'paddle' of the 
1551, usually labeled '6523T'.


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Received on 2012-04-24 18:00:19

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