Re: just dreaming.... 6525.... CPLD ... replacement for 6525

From: didier derny <didier_at_aida.org>
Date: Thu, 26 Jul 2012 14:58:25 +0200
Message-ID: <50113EF1.3060106@aida.org>
Hi,

frankly I never saw nor used this product, but as I was playing with Max 
II  I was thinking that
perhaps it would fit one of the altera cpld

there is also the  EPM7128SLC84-10N but its bigger (PLCC84) and about 4 
times the price of the 7064S...

perhaps that if there is a shortage of 6525 this  method would work....

--
didier



Le 26/07/2012 14:02, davee.roberts@fsmail.net a écrit :
> I have already coded up the VHDL for a 6525 TPI running in MODE 0 only for the CBM II 8088 coprocessor. I have synthesised it for a XILINX
> XC9572-7PC84 - but it could be synthesized for any other device if you have the necessary development tools. The CPLD I have used will
> need to be enhanced if interrupts are to be supported as I have 'maxed out' the macrocell usage of the XILINX device with just mode 0
> supported. I have tested the device in the simulator - but not in reality (I do not have a 6525 chip to compare my code to or any
> Commodore machine(s) to try it in).
>
> If you would like a copy of my VHDL code - please send me a PM and I will be glad to forward you the files.
>
> I would be more than happy to enhance the code to support the full functionality of the 6525 TPI device - but there are a few "grey areas"
> in the device documentation that I have uncovered that we will need to try and 'plug' to ensure 100% compatibility.
>
> The biggest issue is the availability of 5V devices these days - as most manufacturers are moving to 3.3V or 1.8V devices. A small
> daughter card with the requisite voltage regulator and level shifting buffers should solve this problem though. Any PCB guys out there
> interested?
>
> Dave
>
>
>> Message Received: Jul 26 2012, 11:45 AM
>> From: "didier derny" <didier@aida.org>
>> To: cbm-hackers@musoftware.de
>> Cc:
>> Subject: just dreaming.... 6525.... CPLD ... replacement for 6525
>>
>> Hi
>>
>> it's just a dream I had while I was reading the 6500 technical reference
>> manual.
>>
>> recently you were looking for some 6525 to repair some equipement.
>> apparently you never found the count of components you wanted ....
>>
>> any hope to build  a replacement on a small board with a chip like
>> EPM7064SLC44-10N
>>
>> I guess the 6525 is not too complicated .... ?
>> the EPM7064SLC44-10N is 5V PLCC 44 not so expensive...
>>
>> perhaps it could be used on a small board
>>
>> something looking like a rom-el but to replace a 6525 ??
>>
>> is it a problem of cost or an electrical problem ?
>>
>>
>> --
>> didier
>>
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Received on 2012-07-26 13:00:31

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