[Techtoolslist] leland off road pal dump needed u85

[Clay Cowgill]

Since it's an 16L8 (and not an 'R' or 'V') you don't have to worry about any
hidden internal states.

Back around ~2003, Tim Lindquist and I reverse engineered the Capcom CPS2 B
board PALs.  I made a little wiring adapter for the 16L8 to be read as a
2716 EPROM.  (Connect all the inputs to the 'address' lines and the outputs
to the 'data' lines.)  Reading the "2716" produced a binary file of all the
possible input/output combinations.  I extracted that as text and formatted
it in to ABEL table format like:

PAL CONVERTER
; Converting: cap_caw.bin...
[ 0,0,0,0,0,0,0,0,0,0,0,0,0,0 ] -> [ 0,1,0,1 ];
[ 1,0,0,0,0,0,0,0,0,0,0,0,0,0 ] -> [ 0,1,0,1 ];
[ 0,1,0,0,0,0,0,0,0,0,0,0,0,0 ] -> [ 0,1,0,1 ];
[ 1,1,0,0,0,0,0,0,0,0,0,0,0,0 ] -> [ 0,1,0,1 ];
...
[ 0,0,1,1,1,1,1,1,1,1,1,1,1,1 ] -> [ 1,1,1,0 ];
[ 1,0,1,1,1,1,1,1,1,1,1,1,1,1 ] -> [ 1,1,1,0 ];
[ 0,1,1,1,1,1,1,1,1,1,1,1,1,1 ] -> [ 1,1,1,0 ];
[ 1,1,1,1,1,1,1,1,1,1,1,1,1,1 ] -> [ 1,1,1,0 ];

...and then let the ABEL compiler reduce that to equations and a usable .JED
for burning new parts.  A pretty much automatic process that didn't really
require any special 'pal cracking' capable hardware.

The ABEL compiler also produced the intermediate equations which were much
more compact than the big tables-- for example, ~2000 lines of the above
stuff cooked down to:

Y8 = (I4 & !I3
     # I8 & !I4 & I10
     # I4 & !I10
     # !I8 & I4
     # I7
     # I6
     # I5
     # I2
     # I1);

Y6 = (I4 & I3 & I10
     # I4 & !I3 & !I10
     # I9 & I4 & I10
     # !I8 & !I4 & !I10
     # !I9 & !I8 & !I4
     # I8 & I4
     # !I7
     # I6
     # I5
     # I2
     # I1);

Y4 = (I9 & I4 & !I3
     # I4 & !I3 & !I10
     # !I8 & I4 & I3 & I10
     # !I7 & I4 & !I3
     # !I7 & I4 & !I10
     # I8 & I7 & I4
     # I8 & !I7 & !I4 & I10
     # !I8 & I7 & !I4 & !I10
     # !I9 & !I8 & I7 & !I4
     # I6
     # I5
     # I2
     # I1);

Y1 = (!I1); 

-Clay


-----Original Message-----
From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of
Tony htbs
Sent: Monday, March 16, 2015 12:23 PM
To: 'Technical Tools Mail List'
Subject: Re: [Techtoolslist] leland off road pal dump needed u85

U85 is the chip location
I have the 2-22 u85 non track pac
can you dump it if I get it to you
Or can I dump it or get you a file
I have several programmers
I can get a 2-25 u85 trac pac but I need to get it back Where are you
located Let me know thanks tony





For Ivan Stewarts off road
>
> The track pac should be 2-25
>
> And non should be the 02-22
>
> Pal16l8 is the chip
-----Original Message-----
From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of
Fabrizio Vasile
Sent: Monday, March 16, 2015 2:02 PM
To: Technical Tools Mail List
Subject: Re: [Techtoolslist] leland off road pal dump needed u85

Hi, sadly there no available dump of these PAL around.I'm a contributor of
this PAL database:

www.jammarcade.net

and we haven't them too.If someone could provide us the chip we would be
happy to dump them

P.S.
Could you tell me the exact location on PCB and label of this PAL?Maybe they
are share with other Leland games.Thanks.

Il 16/03/2015 18:09, Tony htbs ha scritto:
> Ivan Stewarts off road


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