[Techtoolslist] leland off road pal dump needed u85

[John Robertson]

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

Did anyone ever do the dump of the PALs for the Track Pack version of 
OFFROAD? I have a board in the shop now that I am hoping to be able to 
fix for a customer.

Either that or MAME a replacement into his cabinet, not sure if that 
would work with three steering wheels, but I suspect the Raspberry Pi 
may be up to it as a single emulation...

John :-#)#

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