tisdag 21 februari 2017 skrev Jecel Assumpcao Jr. <je...@merlintec.com>:
> Jim Brain wrote: > > > As a function of "give a man a fish, you feed him for a day; teach a man > > to fish, you feed him for all time", I dloaded Logic Friday, and figured > > out a quick way to read the two 16L8 (combinatorial only) PALs on the > > board with my EPROM reader (cue duct tape and baling wire snickers). > > Don't forget that 16L8 means 8 logic outputs and 16 inputs even though > at first glance there only seems to be 8 inputs. That is because every > output is also an input and can possibly be just an input by forcing the > three state option. > Right now I am in the situation of having a 16L8 with unknown program so I have been thinking (and googling) to find a solution. I have come to the conclusion that this device has to be considered as 262144 by 8 ROM. 18 bits address space because it has 8 three state outputs (six of them may act as inputs) which has to be probed in what way they are active driving or not and then 10 inputs. I was thinking of driving the outputs through a 1k or so resistor and then reading back the outputs. The inputs are of course driven as usual. Then I need to write some small piece of software to deduce the OE pin values and minimise the equations using some program mentioned above in the thread. I have seen someone making a small device to do this. http://dreamjam.co.uk/emuviews/elec/pal.php Unfortunately the software doesn't seem to be available any longer. Anyone that has it? It would definetely save me some time. /Mattis