[Techtoolslist] leland off road pal dump needed u85

[Fabrizio Vasile]

Unfortunately there is no way to reverse registered secured PLDs thru an 
automated process.All you can do is study the behaviour of the device 
and try to reproduce it manually.Anyway, about this Leland Offroad Track 
Pak  PAL16R8, try to read it in a standard EPROM programmer which 
supports this device, it could be unsecured.


Il 07/09/2016 03:17, John Robertson ha scritto:
> On 03/16/2015 1:49 PM, Fabrizio Vasile wrote:
>>
>>
>> Il 16/03/2015 21:33, Clay Cowgill ha scritto:
>>>> I was aware of this possibility of dumping PLD like a normal EPROM but
>>>> there could be issue with some programmers.
>>> Shouldn't be.  It's a five volt part and since you're not writing 
>>> data to
>>> the part the lack of OE shouldn't be an issue.  (I suppose if you were
>>> particularly concerned you could just buffer the output pins with a 
>>> '244
>>> connected to the 2716's CE's and OE.)
>>
>> /*I mean the programmer you are going to use for dumping a PLD as 
>> EPROM must *//**//*actually drive the pins both high and low for this 
>> to work.Some programmers only drive LOW the pins and use pull-up 
>> resistors to force them HIGH.
>>
>> Anyway, like Charles MacDonald explain here:
>>
>> http://dreamjam.co.uk/emuviews/old2009.php
>>
>> you can also read a PAL as a 27C020 EPROM using this simple adapter:
>>
>> http://dreamjam.co.uk/emuviews/temp/adapter2.png
>>
>> *//*/*You will get a 256KB dump that can be analized with his 
>> analysing software in order to recompile equations in a GAL16V8 
>> replacement*/
>> */
>>>
>>> -Clay
> Back to reading PALs.
>
> On a customers Leland Offroad Track Pak I have a PAL16R8 (08-2) to 
> read, and it was suggested here that the 16R8 could be read with the 
> correct technology:
>
> http://marc.info/?l=classiccmp&m=141212179614845&w=2
>
> So, has anyone here found a way to read the registered PALs? Or do I 
> just need to look a little harder on MAME to find the decrypted PAL 
> images?
>
> Thanks,
>
> John :-#)#


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